Exams › SSC CGL (Prelims) › General

If x = sqrt(3), evaluate (x + 1)^2 + (x - 1)^2.

1. 8
2. 7
3. 9
4. 6

Correct answer: 8

Solution

(x+1)^2 + (x-1)^2 expands to 2x^2 + 2 = 2(x^2 + 1). With x^2 = 3 this is 2 x 4 = 8.

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