{"id":44191,"date":"2021-01-20T11:28:34","date_gmt":"2021-01-20T05:58:34","guid":{"rendered":"https:\/\/cracku.in\/blog\/?p=44191"},"modified":"2021-01-20T11:28:34","modified_gmt":"2021-01-20T05:58:34","slug":"ssc-cgl-practice-questions-on-algebra","status":"publish","type":"post","link":"https:\/\/cracku.in\/blog\/ssc-cgl-practice-questions-on-algebra\/","title":{"rendered":"SSC CGL Practice Questions on Algebra"},"content":{"rendered":"<h1><strong>SSC CGL Algebra Questions<\/strong><\/h1>\n<p style=\"text-align: justify;\">Download the most important practice questions on algebra for SSC CGL exam 2020. Most important SSC CGL practice questions based on asked questions in previous exam papers for SSC CGL. These questions with solutions are also helpful for all competitive exams.<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/downloads\/11449\" target=\"_blank\" class=\"btn btn-danger  download\">Download\u00a0 SSC CGL Algebra questions<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/pay\/9m05S\" target=\"_blank\" class=\"btn btn-info \">Get 125 SSC CGL Mocks &#8211; Just Rs. 199<\/a><\/p>\n<p>Take a<a href=\"https:\/\/cracku.in\/ssc-cgl-online-mock-tests\"> free SSC CGL Tier-1 mock test<\/a><\/p>\n<p>Download<a href=\"https:\/\/cracku.in\/ssc-cgl-previous-papers\"> SSC CGL Tier-1 Previous Papers PDF<\/a><\/p>\n<p><b>Question 1:\u00a0<\/b>If $x^{2}+\\frac{1}{5}x+a^{2}$ is a perfect square then a is<\/p>\n<p>a)\u00a0$\\frac{1}{100}$<\/p>\n<p>b)\u00a0$\\frac{1}{5}$<\/p>\n<p>c)\u00a0$\\frac{1}{10}$<\/p>\n<p>d)\u00a010<\/p>\n<p><b>Question 2:\u00a0<\/b>Given that $1^{2}+2^{2}+3^{2}+&#8230;..+10^{2}=385$ the value of $2^{2}+4^{2}+6^{2}+&#8230;.20^{2}=$<\/p>\n<p>a)\u00a0770<\/p>\n<p>b)\u00a01540<\/p>\n<p>c)\u00a01155<\/p>\n<p>d)\u00a0(385)<\/p>\n<p><b>Question 3:\u00a0<\/b>If ab + bc+ ca = 0, then the value of $\\frac{1}{a^2-bc}+\\frac{1}{b^2-ac}+\\frac{1}{c^2-ab}$<\/p>\n<p>a)\u00a02<\/p>\n<p>b)\u00a0-1<\/p>\n<p>c)\u00a00<\/p>\n<p>d)\u00a01<\/p>\n<p><b>Question 4:\u00a0<\/b>If the equation $2x^{2}-7x+12=0$ has two roots $\\alpha$ <span class=\"redactor-invisible-space\">and $\\beta$<span class=\"redactor-invisible-space\"> then the value of $\\frac{\\alpha}{\\beta}$+$\\frac{\\beta}{\\alpha}$<span class=\"redactor-invisible-space\"> is<\/span><\/span><\/span><\/p>\n<p>a)\u00a0$\\frac{7}{2}$<\/p>\n<p>b)\u00a0$\\frac{1}{24}$<\/p>\n<p>c)\u00a0$\\frac{7}{24}$<\/p>\n<p>d)\u00a0$\\frac{97}{24}$<\/p>\n<p><b>Question 5:\u00a0<\/b>Find the value of x for which the expression $2 &#8211; 3x- 4x^{2}$ has the greatest value.<\/p>\n<p>a)\u00a0$-\\frac{41}{16}$<\/p>\n<p>b)\u00a0$\\frac{3}{8}$<\/p>\n<p>c)\u00a0$-\\frac{3}{8}$<\/p>\n<p>d)\u00a0$\\frac{41}{16}$<\/p>\n<p><b>Question 6:\u00a0<\/b>The expression $x^4- 2x^2 + k$ will be a perfect square if the value of k is<\/p>\n<p>a)\u00a0$1$<\/p>\n<p>b)\u00a0$0$<\/p>\n<p>c)\u00a0$\\frac{1}{4}$<\/p>\n<p>d)\u00a0$\\frac{1}{2}$<\/p>\n<p><b>Question 7:\u00a0<\/b>If (x-1) and (x+3) are the factors of $x^{2}+k_{1}x + k_{2}$ then<\/p>\n<p>a)\u00a0$k_{1}=-2 ,k_{2}=-3$<\/p>\n<p>b)\u00a0$k_{1}=2 ,k_{2}=-3$<\/p>\n<p>c)\u00a0$k_{1}=2 ,k_{2}=3$<\/p>\n<p>d)\u00a0$k_{1}=-2 ,k_{2}=3$<\/p>\n<p><b>Question 8:\u00a0<\/b>If $\\frac{5x}{2x^2+5x+1}=\\frac{1}{3}$ then the value of $(x+\\frac{1}{2x})$<span class=\"redactor-invisible-space\"> is <\/span><\/p>\n<p>a)\u00a015<\/p>\n<p>b)\u00a010<\/p>\n<p>c)\u00a020<\/p>\n<p>d)\u00a05<\/p>\n<p><b>Question 9:\u00a0<\/b>If $x^{2}+\\frac{1}{x^2}=66$ then the value of $\\frac{x^2-1+2x}{x}=$ ?<\/p>\n<p>a)\u00a0\u00b1 8<\/p>\n<p>b)\u00a010, &#8211; 6<\/p>\n<p>c)\u00a06, -10<\/p>\n<p>d)\u00a0\u00b1 4<\/p>\n<p><b>Question 10:\u00a0<\/b>If $a^{2} + a+ 1 = 0$, then the value of $a^{9}$ is<\/p>\n<p>a)\u00a02<\/p>\n<p>b)\u00a03<\/p>\n<p>c)\u00a01<\/p>\n<p>d)\u00a00<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/t.me\/crackubanking\" target=\"_blank\" class=\"btn btn-info \">Join Exam Preparation Telegram Group<\/a><\/p>\n<p><b>Question 11:\u00a0<\/b>Find the value of $\\sqrt{(x^2+y^2+2)(x+y-32)}\\div \\sqrt{xy^3 2^2}$ when $x=+1,y=-3$<\/p>\n<p>a)\u00a01<\/p>\n<p>b)\u00a00<\/p>\n<p>c)\u00a0$\\frac{34}{3}$<\/p>\n<p>d)\u00a02<\/p>\n<p><b>Question 12:\u00a0<\/b>If a = 2 + \u221a3 ,then the value of $(a^{2}+\\frac{1}{a^{2}})$ is<\/p>\n<p>a)\u00a012<\/p>\n<p>b)\u00a014<\/p>\n<p>c)\u00a016<\/p>\n<p>d)\u00a010<\/p>\n<p>e)\u00a0Non of These<\/p>\n<p><b>Question 13:\u00a0<\/b>If x + y = 15, then $(x-10)^{3}+(y-5)^{3}$ is<\/p>\n<p>a)\u00a025<\/p>\n<p>b)\u00a0125<\/p>\n<p>c)\u00a0625<\/p>\n<p>d)\u00a00<\/p>\n<p><b>Question 14:\u00a0<\/b>If a + b = 6, a &#8211; b = 2, then the value of 2*(a^2 + b^2 ) is :<\/p>\n<p>a)\u00a020<\/p>\n<p>b)\u00a030<\/p>\n<p>c)\u00a040<\/p>\n<p>d)\u00a010<\/p>\n<p><b>Question 15:\u00a0<\/b>The value of x when 5% of \u221a2x is 0.01 will be :<\/p>\n<p>a)\u00a00.03<\/p>\n<p>b)\u00a00.02<\/p>\n<p>c)\u00a00.01<\/p>\n<p>d)\u00a00.05<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/pay\/9m05S\" target=\"_blank\" class=\"btn btn-info \">Get 125 SSC CGL Mocks &#8211; Just Rs. 199<\/a><\/p>\n<p><b>Question 16:\u00a0<\/b>If $\\sqrt{\\frac{x-a}{x-b}}+\\frac{a}{x}=\\sqrt{\\frac{x-b}{x-a}}+\\frac{b}{x}$ and $b \\neq a$, then the value of $x$ is<\/p>\n<p>a)\u00a0$\\frac{b}{a+b}$<\/p>\n<p>b)\u00a0$\\frac{ab}{a+b}$<\/p>\n<p>c)\u00a01<\/p>\n<p>d)\u00a0$\\frac{a}{a+b}$<\/p>\n<p><b>Question 17:\u00a0<\/b>If $x = \\frac{2\\sqrt{24}}{\\sqrt{3}+\\sqrt{2}}$, then the value of $\\frac{x+\\sqrt{8}}{x-\\sqrt{8}}+\\frac{x+\\sqrt{12}}{x-\\sqrt{12}}$ is<\/p>\n<p>a)\u00a01<\/p>\n<p>b)\u00a02<\/p>\n<p>c)\u00a03<\/p>\n<p>d)\u00a0-2<\/p>\n<p><b>Question 18:\u00a0<\/b>If $a=\\frac{2+\\sqrt{3}}{2-\\sqrt{3}}$ and $b=\\frac{2-\\sqrt{3}}{2+\\sqrt{3}}$, then the value of $a^2+b^2+a \\times b$ is<\/p>\n<p>a)\u00a0185<\/p>\n<p>b)\u00a0195<\/p>\n<p>c)\u00a0200<\/p>\n<p>d)\u00a0175<\/p>\n<p><b>Question 19:\u00a0<\/b>If $x = \\frac{2\\sqrt{6}}{\\sqrt{3}+\\sqrt{2}}$, then the value of $\\frac{x+\\sqrt{2}}{x-\\sqrt{2}} + \\frac{x+\\sqrt{3}}{x-\\sqrt{3}}$ is<\/p>\n<p>a)\u00a0$\\sqrt{2}$<\/p>\n<p>b)\u00a0$\\sqrt{3}$<\/p>\n<p>c)\u00a0$\\sqrt{6}$<\/p>\n<p>d)\u00a0$2$<\/p>\n<p><b>Question 20:\u00a0<\/b>If $\\sqrt{4x-9}+\\sqrt{4x+9}=5+\\sqrt{7}$, then the value of $x$ is<\/p>\n<p>a)\u00a04<\/p>\n<p>b)\u00a05<\/p>\n<p>c)\u00a07<\/p>\n<p>d)\u00a03<\/p>\n<p>More<a href=\"https:\/\/cracku.in\/blog\/ssc-cgl-questions-answers-pdf\/\"> SSC CGL Important Questions and Answers PDF<\/a><\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Answers &amp; Solutions:<\/strong><\/span><\/p>\n<p><strong>1)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Expression : $x^{2}+\\frac{1}{5}x+a^{2}$<\/p>\n<p>= $[(x^2) + (2 * \\frac{1}{10} * x) + (\\frac{1}{10})^2] + a^2 &#8211; (\\frac{1}{10})^2$<\/p>\n<p>= $(x + \\frac{1}{10})^2 + a^2 &#8211; (\\frac{1}{10})^2$<\/p>\n<p>Now, for the above expression to be perfect square,<\/p>\n<p>=&gt; $a^2 &#8211; (\\frac{1}{10})^2 = 0$<\/p>\n<p>=&gt; $a^2 = (\\frac{1}{10})^2$<\/p>\n<p style=\"margin-left: 20px;\">=&gt; $a = \\frac{1}{10}$<\/p>\n<p><strong>2)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>Given that $1^{2}+2^{2}+3^{2}+&#8230;..+10^{2}=385$<\/p>\n<p>Now,<\/p>\n<p>$2^{2}+4^{2}+6^{2}+&#8230;.20^{2}=(1^{2}+2^{2}+3^{2}+&#8230;..+10^{2}) \\times 2^2 = 4 \\times 385 = 1540$<\/p>\n<p><strong>3)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Since, $ab + bc + ca = 0$<\/p>\n<p>If we take $a = b = 1$, =&gt; $c = \\frac{-1}{2}$<\/p>\n<p>To find : $\\frac{1}{a^2-bc}+\\frac{1}{b^2-ac}+\\frac{1}{c^2-ab}$<\/p>\n<p>Substituting values of $a,b,c$ we get :<\/p>\n<p>= $\\frac{1}{1 &#8211; (\\frac{-1}{2})} + \\frac{1}{1 &#8211; (\\frac{-1}{2})} + \\frac{1}{(\\frac{1}{4}) &#8211; 1}$<\/p>\n<p>= $\\frac{1}{\\frac{3}{2}} + \\frac{1}{\\frac{3}{2}} + \\frac{1}{\\frac{-3}{4}}$<\/p>\n<p>= $\\frac{2}{3} + \\frac{2}{3} &#8211; \\frac{4}{3}$<\/p>\n<p>= $\\frac{4}{3} &#8211; \\frac{4}{3} = 0$<\/p>\n<p><strong>4)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>Equation : $2x^{2}-7x+12=0$<\/p>\n<p>=&gt; Sum of roots = $\\alpha + \\beta = \\frac{7}{2}$<\/p>\n<p>=&gt; Product of roots = $\\alpha \\beta = \\frac{12}{2} = 6$<\/p>\n<p>To find : $\\frac{\\alpha}{\\beta}$+$\\frac{\\beta}{\\alpha}$<\/p>\n<p><span class=\"redactor-invisible-space\">= $\\frac{\\alpha^2 + \\beta^2}{\\alpha \\beta}$<\/span><\/p>\n<p><span class=\"redactor-invisible-space\">= $\\frac{(\\alpha + \\beta)^2 &#8211; 2 \\alpha\\beta}{\\alpha \\beta}$<\/span><\/p>\n<p><span class=\"redactor-invisible-space\">= $\\frac{\\frac{49}{4} &#8211; 12}{6}$<\/span><\/p>\n<p><span class=\"redactor-invisible-space\">= $\\frac{\\frac{1}{4}}{6} = \\frac{1}{24}$<\/span><\/p>\n<p><strong>5)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>NOTE :- To find the min\/max value of an expression, we need to differentiate it, and put the first derivative equal to &#8216;0&#8217; to find value of $x$<\/p>\n<p>Then, we need to differentiate it again and put value of $x$, if second derivative is less than zero, then $x$ is maxima otherwise $x$ is minima.<\/p>\n<hr \/>\n<p>Expression : $y$ = $2 &#8211; 3x- 4x^{2}$<\/p>\n<p>=&gt; $\\frac{dy}{dx} = -3 &#8211; 8x$<\/p>\n<p>Now, putting it equal to 0, we get :<\/p>\n<p>=&gt; $y&#8217; = -3 -8x = 0$<\/p>\n<p>=&gt; $x = \\frac{-3}{8}$<\/p>\n<p>Differentiating it again :<\/p>\n<p>=&gt; $\\frac{d^2y}{dx^2} = -8$<\/p>\n<p>Since, it is less than &#8216;0&#8217; ,=&gt; $x = \\frac{-3}{8}$ is maximum value.<\/p>\n<p><strong>6)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>It is clear that we have to write the expression in the form $(a-b)^2$.<br \/>\nThe second term in the given expression in $-2x^2$. This expression must correspond to the form 2ab. Hence, $a = x^2$ and $ b=1$.<br \/>\nHence, k must be equal to 1 for the expression to be a perfect square.<br \/>\nOption A is the right answer.<\/p>\n<p><strong>7)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p><strong><u><em>METHOD1:<\/em><\/u><\/strong><\/p>\n<p>If (x-1) and (x+3) are the factors of $x^{2}+k_{1}x + k_{2}$<\/p>\n<p>then its zeros are 1, -3<\/p>\n<p>sum of zeros = $-k_{1}=-2\\rightarrow k_{1}=2$<\/p>\n<p>product of zeros =\u00a0$k_{2}=-3\\rightarrow k_{2}=-3$<\/p>\n<p>so the answer is option B.<\/p>\n<p><strong><em><u>METHOD2:<\/u><\/em><\/strong><\/p>\n<p>Multiply (x-1) and\u00a0(x+3)<\/p>\n<p>= $x^{2}-x+3x-3$<\/p>\n<p>=\u00a0$x^{2}+2x-3$<\/p>\n<p>now, compare\u00a0\u00a0$x^{2}+2x-3$ with\u00a0$x^{2}+k_{1}x + k_{2}$<\/p>\n<p>$k_{1}=2$ and $k_{2}=-3$<\/p>\n<p>so the answer is option B.<\/p>\n<p><strong>8)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>Expression : $\\frac{5x}{2x^2+5x+1}=\\frac{1}{3}$<\/p>\n<p>=&gt; $2x^2 + 5x + 1 = 15x$<\/p>\n<p>=&gt; $2x^2 + 1 = 10x$<\/p>\n<p>To find : $(x+\\frac{1}{2x})$<\/p>\n<p><span class=\"redactor-invisible-space\">= $\\frac{2x^2 + 1}{2x}$<\/span><\/p>\n<p><span class=\"redactor-invisible-space\">= $\\frac{10x}{2x}$<\/span><\/p>\n<p><span class=\"redactor-invisible-space\">= 5<\/span><\/p>\n<p><strong>9)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>Expression : $x^{2}+\\frac{1}{x^2}=66$<\/p>\n<p>=&gt; $(x &#8211; \\frac{1}{x})^2 + 2 = 66$<\/p>\n<p>=&gt; $(x &#8211; \\frac{1}{x})^2 = 64$<\/p>\n<p>=&gt; $x &#8211; \\frac{1}{x} = \\pm 8$<\/p>\n<p>To find : $\\frac{x^2-1+2x}{x}$<\/p>\n<p>= $x &#8211; \\frac{1}{x} + 2$<\/p>\n<p>= $(8 + 2)$ and $(-8 + 2)$<\/p>\n<p>= 10 and -6<\/p>\n<p><strong>10)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>Expression : $a^{2} + a+ 1 = 0$<\/p>\n<p>Multiplying both sides by $(a-1)$ , we get :<\/p>\n<p>=&gt; $(a-1)(a^2 + a + 1) = 0$<\/p>\n<p>=&gt; $a^3 &#8211; 1 = 0$<\/p>\n<p>=&gt; $a^3 = 1$<\/p>\n<p>Cubing both sides<\/p>\n<p>=&gt; $a^9 = 1$<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/www.youtube.com\/channel\/UCMDJPaiDdRPv2mrEJoLfklA\" target=\"_blank\" class=\"btn btn-primary \">Free SSC Preparation Videos<\/a><\/p>\n<p><strong>11)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>we need to find value of $\\sqrt{(x^2+y^2+2)(x+y-32)}\\div \\sqrt{xy^3 2^2}$ when $x=+1,y=-3$<\/p>\n<p>putting value of x , y<\/p>\n<p>$\\sqrt{(1^2 + (-3)^2 + 2)\\times(1 &#8211; 3 &#8211; 32)}\\div \\sqrt{1 \\times (-3)^3 \\times 4}$<\/p>\n<p>= 34\/3<\/p>\n<p><strong>12)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>a = 2 + \u221a3<\/p>\n<p>$(a^{2}+\\frac{1}{a^{2}})$ = $(a + \\frac{1}{a})^2$ &#8211; 2<\/p>\n<p><span class=\"redactor-invisible-space\">here ,<\/span><\/p>\n<p>$a = 2+\\sqrt{3}$<\/p>\n<p>$\\dfrac{1}{a} = \\dfrac{1}{2+\\sqrt{3}} \\times\\dfrac{2-\\sqrt{3}}{2-\\sqrt{3}} = 2-\\sqrt{3}$<\/p>\n<p>$a+\\dfrac{1}{a} = 2+\\sqrt{3} +\u00a0\u00a02-\\sqrt{3}$<\/p>\n<p>$a + \\dfrac{1}{a} = 4$<\/p>\n<p><span class=\"redactor-invisible-space\"><span class=\"redactor-invisible-space\">So, $(a + \\frac{1}{a})^2$ &#8211; 2<span class=\"redactor-invisible-space\"> = 14<\/span><\/span><\/span><\/p>\n<p><strong>13)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>given that x + y = 15<\/p>\n<p>So reaaranging the above equation<\/p>\n<p>(x -10 ) + (y-5) =0<\/p>\n<p>Now , x-10 =-( y -5 )<\/p>\n<p>On cubing both sides<\/p>\n<p>$(x-10)^3$ =- $(y-5)^3$<\/p>\n<p>And hence<\/p>\n<p>$(x-10)^3$ + $(y-5)^3$ =0<\/p>\n<p><strong>14)\u00a0Answer\u00a0(C)<\/strong><\/p>\n<p>here we are given with<\/p>\n<p>a + b = 6&#8230;&#8230;.(1)<\/p>\n<p>a &#8211; b = 2&#8230;(2)<\/p>\n<p>adding both equations<\/p>\n<p>2a = 8<\/p>\n<p>a = 4<\/p>\n<p>so b = 2<\/p>\n<p>we need to calculate $2 \\times (a^2 + b^2 ) = 2 \\times (4^2 + 2^2) = 40$<\/p>\n<p><strong>15)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>It is given that 5% of \u221a2x is 0.01<\/p>\n<p>$\\frac{5}{100} \\times \\surd(2x)$ = 0.01<\/p>\n<p>x = 0.02<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/pay\/9m05S\" target=\"_blank\" class=\"btn btn-info \">Get 125 SSC CGL Mocks &#8211; Just Rs. 199<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/cracku.in\/ssc-study-material\" target=\"_blank\" class=\"btn btn-alone \">18000+ Questions &#8211; Free SSC Study Material<\/a><\/p>\n<p><strong>16)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p><strong>17)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>Given\u00a0:\u00a0$x = \\frac{2\\sqrt{24}}{\\sqrt{3}+\\sqrt{2}}$<\/p>\n<p>=&gt;\u00a0$x = \\frac{2\\sqrt{24}}{\\sqrt{3}+\\sqrt{2}}\\times(\\frac{\\sqrt3-\\sqrt2}{\\sqrt3-\\sqrt2})$<\/p>\n<p>=&gt; $x=\\frac{2\\sqrt{24}(\\sqrt3-\\sqrt2)}{3-2}$<\/p>\n<p>=&gt; $x=2\\sqrt{72}-2\\sqrt{48}$<\/p>\n<p>=&gt; $x=6\\sqrt8-4\\sqrt{12}$ &#8212;&#8212;&#8212;&#8212;&#8212;(i)<\/p>\n<p>To find\u00a0:\u00a0$\\frac{x+\\sqrt{8}}{x-\\sqrt{8}}+\\frac{x+\\sqrt{12}}{x-\\sqrt{12}}$<\/p>\n<p>=\u00a0$\\frac{6\\sqrt8-4\\sqrt{12}+\\sqrt{8}}{6\\sqrt8-4\\sqrt{12}-\\sqrt{8}} + \\frac{6\\sqrt8-4\\sqrt{12}+\\sqrt{12}}{6\\sqrt8-4\\sqrt{12}-\\sqrt{12}}$ \u00a0 \u00a0 [Using (i)]<\/p>\n<p>=\u00a0$\\frac{7\\sqrt{8}-4\\sqrt{12}}{5\\sqrt{8}-4\\sqrt{12}} + \\frac{6\\sqrt8-3\\sqrt{12}}{6\\sqrt8-5\\sqrt{12}}$<\/p>\n<p>= $\\frac{(336-35\\sqrt{96}-24\\sqrt{96}+240)+(240-15\\sqrt{96}-24\\sqrt{96}+144)}{240-25\\sqrt{96}-24\\sqrt{96}+240}$<\/p>\n<p>= $\\frac{960-98\\sqrt{96}}{480-49\\sqrt{96}}$<\/p>\n<p>= $\\frac{2(480-49\\sqrt6)}{480-49\\sqrt6}=2$<\/p>\n<p>=&gt; Ans &#8211; (B)<\/p>\n<p><strong>18)\u00a0Answer\u00a0(B)<\/strong><\/p>\n<p>$a=\\frac{2+\\sqrt{3}}{2-\\sqrt{3}}$ on rationalising we will get a = $(2 + \\surd3)^2$<\/p>\n<p>$b=\\frac{2-\\sqrt{3}}{2+\\sqrt{3}}$<span class=\"redactor-invisible-space\"> on rationalizing we will get b = $(2 &#8211; \\surd3)^2$<br \/>\n<\/span><\/p>\n<p>now putting values of a and b in , $a^2+b^2+a \\times b$<\/p>\n<p><span class=\"redactor-invisible-space\"> $a^2+b^2+a \\times b$<span class=\"redactor-invisible-space\"> = 195<br \/>\n<\/span><\/span><\/p>\n<p><strong>19)\u00a0Answer\u00a0(D)<\/strong><\/p>\n<p>Given\u00a0:\u00a0$x = \\frac{2\\sqrt{6}}{\\sqrt{3}+\\sqrt{2}}$<\/p>\n<p>=&gt;\u00a0$x = \\frac{2\\sqrt{6}}{\\sqrt{3}+\\sqrt{2}}\\times(\\frac{\\sqrt3-\\sqrt2}{\\sqrt3-\\sqrt2})$<\/p>\n<p>=&gt; $x=\\frac{2\\sqrt6(\\sqrt3-\\sqrt2)}{3-2}$<\/p>\n<p>=&gt; $x=2\\sqrt{18}-2\\sqrt{12}$<\/p>\n<p>=&gt; $x=6\\sqrt2-4\\sqrt3$ &#8212;&#8212;&#8212;&#8212;&#8212;(i)<\/p>\n<p>To find\u00a0:\u00a0$\\frac{x+\\sqrt{2}}{x-\\sqrt{2}} + \\frac{x+\\sqrt{3}}{x-\\sqrt{3}}$<\/p>\n<p>=\u00a0$\\frac{6\\sqrt2-4\\sqrt3+\\sqrt{2}}{6\\sqrt2-4\\sqrt3-\\sqrt{2}} + \\frac{6\\sqrt2-4\\sqrt3+\\sqrt{3}}{6\\sqrt2-4\\sqrt3-\\sqrt{3}}$ \u00a0 \u00a0 [Using (i)]<\/p>\n<p>=\u00a0$\\frac{7\\sqrt{2}-4\\sqrt3}{5\\sqrt{2}-4\\sqrt3} + \\frac{6\\sqrt2-3\\sqrt{3}}{6\\sqrt2-5\\sqrt{3}}$<\/p>\n<p>= $\\frac{(84-35\\sqrt6-24\\sqrt6+60)+(60-15\\sqrt6-24\\sqrt6+36)}{60-25\\sqrt6-24\\sqrt6+60}$<\/p>\n<p>= $\\frac{240-98\\sqrt6}{120-49\\sqrt6}$<\/p>\n<p>= $\\frac{2(120-49\\sqrt6)}{120-49\\sqrt6}=2$<\/p>\n<p>=&gt; Ans &#8211; (D)<\/p>\n<p><strong>20)\u00a0Answer\u00a0(A)<\/strong><\/p>\n<p>given that<\/p>\n<p>$\\sqrt{4x-9}+\\sqrt{4x+9}=5+\\sqrt{7}$<\/p>\n<p>$\\sqrt{4x-9} &#8211; 5 = \\sqrt{7} &#8211; \\sqrt{4x+9}$<\/p>\n<p>on squaring both sides<\/p>\n<p>4x &#8211; 9 + 25 + 10$\\sqrt{4x+9}$ = 7 + 4x + 9 &#8211; 2$\\sqrt{28x+63}$<\/p>\n<p>10$\\sqrt{4x-9}$\u00a0 = 2$\\sqrt{28x+63}$<\/p>\n<p>on squaring both sides again<\/p>\n<p>400x &#8211; 900 = 112x + 252<\/p>\n<p>288x = 1152<\/p>\n<p>x = 4<\/p>\n<p class=\"text-center\"><a href=\"https:\/\/t.me\/crackubanking\" target=\"_blank\" class=\"btn btn-info \">Join Exam Preparation Telegram Group<\/a><\/p>\n<p class=\"text-center\"><a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.cracku.app&amp;hl=en_IN&amp;gl=IN\" target=\"_blank\" class=\"btn btn-danger \">Download SSC Preparation App<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SSC CGL Algebra Questions Download the most important practice questions on algebra for SSC CGL exam 2020. Most important SSC CGL practice questions based on asked questions in previous exam papers for SSC CGL. These questions with solutions are also helpful for all competitive exams. Take a free SSC CGL Tier-1 mock test Download SSC [&hellip;]<\/p>\n","protected":false},"author":53,"featured_media":44193,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[9,504],"tags":[2308,1625,462],"class_list":{"0":"post-44191","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-ssc","8":"category-ssc-cgl","9":"tag-algebra","10":"tag-maths","11":"tag-ssc-cgl"},"better_featured_image":{"id":44193,"alt_text":"SSC CGL practice questions on algebra","caption":"SSC CGL practice questions on algebra","description":"SSC CGL practice questions on algebra","media_type":"image","media_details":{"width":994,"height":546,"file":"2021\/01\/fig-19-01-2021_03-53-43.jpg","sizes":{"medium":{"file":"fig-19-01-2021_03-53-43-300x165.jpg","width":300,"height":165,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-300x165.jpg"},"thumbnail":{"file":"fig-19-01-2021_03-53-43-150x150.jpg","width":150,"height":150,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-150x150.jpg"},"medium_large":{"file":"fig-19-01-2021_03-53-43-768x422.jpg","width":768,"height":422,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-768x422.jpg"},"tiny-lazy":{"file":"fig-19-01-2021_03-53-43-30x16.jpg","width":30,"height":16,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-30x16.jpg"},"td_218x150":{"file":"fig-19-01-2021_03-53-43-218x150.jpg","width":218,"height":150,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-218x150.jpg"},"td_324x400":{"file":"fig-19-01-2021_03-53-43-324x400.jpg","width":324,"height":400,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-324x400.jpg"},"td_696x0":{"file":"fig-19-01-2021_03-53-43-696x382.jpg","width":696,"height":382,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-696x382.jpg"},"td_0x420":{"file":"fig-19-01-2021_03-53-43-765x420.jpg","width":765,"height":420,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-765x420.jpg"},"td_80x60":{"file":"fig-19-01-2021_03-53-43-80x60.jpg","width":80,"height":60,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-80x60.jpg"},"td_100x70":{"file":"fig-19-01-2021_03-53-43-100x70.jpg","width":100,"height":70,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-100x70.jpg"},"td_265x198":{"file":"fig-19-01-2021_03-53-43-265x198.jpg","width":265,"height":198,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-265x198.jpg"},"td_324x160":{"file":"fig-19-01-2021_03-53-43-324x160.jpg","width":324,"height":160,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-324x160.jpg"},"td_324x235":{"file":"fig-19-01-2021_03-53-43-324x235.jpg","width":324,"height":235,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-324x235.jpg"},"td_356x220":{"file":"fig-19-01-2021_03-53-43-356x220.jpg","width":356,"height":220,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-356x220.jpg"},"td_356x364":{"file":"fig-19-01-2021_03-53-43-356x364.jpg","width":356,"height":364,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-356x364.jpg"},"td_533x261":{"file":"fig-19-01-2021_03-53-43-533x261.jpg","width":533,"height":261,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-533x261.jpg"},"td_534x462":{"file":"fig-19-01-2021_03-53-43-534x462.jpg","width":534,"height":462,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-534x462.jpg"},"td_696x385":{"file":"fig-19-01-2021_03-53-43-696x385.jpg","width":696,"height":385,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-696x385.jpg"},"td_741x486":{"file":"fig-19-01-2021_03-53-43-741x486.jpg","width":741,"height":486,"mime-type":"image\/jpeg","source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43-741x486.jpg"}},"image_meta":{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}},"post":44191,"source_url":"https:\/\/cracku.in\/blog\/wp-content\/uploads\/2021\/01\/fig-19-01-2021_03-53-43.jpg"},"yoast_head":"<!-- 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