For the function f(x)=(7-8x)^2 find f^-1. determine whether f^-1 is a function.

The inverse of

f(x) = (7-8x)^2

is ............. f-1(x) = 1/8 *(7 ±sqrt(x))

If we plot this graph We can easily see it is not a function

 (Fails the vertical line test)