Question

If `x - 1/x` = 11, then find the value of `(x^2 + 1/x^2)`.

पर्याय

• 213

• 123

• 121

• None of these

Answer 1

123

Explanation:

`(x - 1/x)^2 = x^2 + 1/x^2 - 2`

`x^2 + 1/x^2 = (x - 1/x)^2 + 2`

= 11² + 2

= 121 + 2

= 123