AlgebraOne to one function
posted by Soly .
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)=x7/(4)
2. f(x)= square root of x8
I got f^1(x)=x^28
3. f(x)=4/(5x1)
This one I don't understand how to find the inverse of the 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.