Question

If f(x) =2x-1, then f^-1(x)=???

Answer 1

f^-1 = (x+1)/2

check:

f^-1(f) = (f+1)/2 = (2x-1+1)/2 = x
f(f^-1) = 2f^-1 - 1 = 2(x+1)/2 - 1 = x