NatalieLove Group Title please dont solve help on the first step: Let f(x) = x2 – 81. Find f–1(x). 2 years ago 2 years ago

1. moneybird

y = x^2 - 81 x = y^2 - 81 plus/minus sqrt(x + 81) = y

2. moneybird

$f^{-1} = \pm \sqrt{x+81}$

3. NatalieLove