Question

if f(x) = sqrt (x-1) has an inverse function, use the inverse to find (f^-1) (2)

Answer 1

y= sqrt(x-1)
square both sides
y^2 = x-1
x = y^2 - 1
so :
f-1(x) = x^2 + 1
f-1(x) = 2^2 +1 = 5

Answer 2

if you want to check yourself then you plug y(5) and should get 2 ..

Answer 3

yep thanks man!