Question

What is the value of `f(x)` among the following option?

Answer 1

Option 2.

Explanation:

With Option 2 `f(x) = x^2-2`

Then, `f(x+1/x) = (x+1/x)^2-2`

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

`= x^2+1/x^2`

`:.` Option 2 satisfies the condition.