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Question 78
Which of the following is the correct rationalize form of $$\frac{15}{\sqrt{5}+2}=?$$
Solution
Expression : $$\frac{15}{\sqrt{5}+2}=?$$
Rationalizing the denominator, we get :
= $$\frac{15}{\sqrt{5}+2}\times\frac{(\sqrt5-2)}{(\sqrt5-2)}$$
= $$\frac{15(\sqrt5-2)}{5-4}=15\sqrt5-30$$
=> Ans - (C)
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