Instructions

Instructions: What will come in place of question mark (?) in the following questions?

Question 52

[(5$$\sqrt{7}$$ + $$\sqrt{7}$$ ) × (4$$\sqrt{7}$$ + 8$$\sqrt{7}$$ )] - (19)2 = ?

Solution

[(5$$\sqrt{7}$$ + $$\sqrt{7}$$ ) × (4$$\sqrt{7}$$ + 8$$\sqrt{7}$$ )] - (19)2
= [6$$\sqrt{7}$$ x 12$$\sqrt{7}$$] - 192
= [72 x 7] - 192
= 143

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