Question

Which function below is the inverse of f(x) = x2 − 36?

Answer 1

The answer is f−1(x)=√36+x,−√36+x

Answer 2

$f(x) = x^2 - 36$

$y = x^2 - 36$

$x = y^2 - 36$

$y^2 = x + 36$

$y = \pm \sqrt{x + 36}$

$f^{-1}(x) = \pm \sqrt{x + 36}$