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1. x2+1x2=38

A. $\pm 40$
B. $\pm 40$
C. $\pm 40$
D. $\pm 40$

Answer: Option B

Explanation:

x^{2} + \frac{1}{x^{2}} = 38 \Rightarrow {(x - \frac{1}{x})}^{2} + 2 . x . \frac{1}{x} = 38 \Rightarrow {(x - \frac{1}{x})}^{2} = 36 .' . x - \frac{1}{x} = \pm 6

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