Algebra-One to one function

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Could you please check my answers and help me with one of them?

Find the inverse of the one to one function

1. f(x)-4x+7
-I got f^-1(x)=x-7/(-4)

2. f(x)= square root of x-8
-I got f^-1(x)=x^2-8

3. f(x)=4/(5x-1)
This one I don't understand how to find the inverse of the one to one function.

  • Algebra-One to one function -

    Why is the square of an addiction : (a+b)^2 = a^2+b^2 +2ab? Write an example describing the operation.

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