Question

Let f(x) = x2 – 81. Find f–1(x).

Answer 1

Is this the same as subtracting 1 to the function f(x)?

Answer 2

Or maybe you just have to multiply everything in the function by (-1)

It's really hard to tell.

Answer 3

Most likely he wants \[\Large f^{-1}(x)\]

Answer 4

do u mean f^-1