SOLUTION: https://ibb.co/KD8xkbh

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Question 1187567: https://ibb.co/KD8xkbh
Answer by MathLover1(20855) About Me  (Show Source):
You can put this solution on YOUR website!

f%28x%29=5x
inverse:
f%28x%29=y
y=5x...............swap variables
x=5y...........solve for y
y=x%2F5
f%5E-1%28x%29=x%2F5
verify that f%28f%5E-1%28x%29%29=x and f%5E-1%28f%28x%29%29=x

f%28f%5E-1%28x%29%29=f%28x%2F5%29
=5%28x%2F5%29
=x

f%5E-1%28f%28x%29%29=f%5E-1%285x%29
=%285x%29%2F5
=x