Exams › SSC CGL (Prelims) › General

What will come in place of ? to satisfy the equation: $(\sqrt{7}-1)^2 = ? - 2\sqrt{7}$

1. 8
2. 7
3. 6
4. 5

Correct answer: 8

Solution

Expanding gives $(\sqrt{7}-1)^2 = 7+1-2\sqrt{7} = 8-2\sqrt{7}$. Comparing with $? - 2\sqrt{7}$, we get $?=8$.

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