Question

if f(x)=x^2 -1. what is the equation for f^-1(x)

Answer 1

this function is not one to one so doesn't have an inverse

Answer 2

....f^-1(x)= +/- (squareroot all)x+1
...f^-1(x)= +/- (squareroot all )x-1
....f^-1(x)= +/- (squareroot x only) x+1
....f^-1(x)= +/- (squareroot x only) x-1

Answer 3

if these are you choices you must pick one and then tell your on line system that they are giving wrong math