Question

give the function f(x)=-8x+1 find f-1 (-15)

Answer 1

do u mean f^-1(-15)

Answer 2

Find the inverse function first by swapping x and y.
x=-8y+1
f^-1(x)=-(x-1)/8
-(-15-1)/8=16/8=2

Answer 3

Thank you I had difficulty finding the steps to the solution.