I've got two functions [f(x) and g(x)] which I need to find the inverse of [f-(x) and g-(x)], can someone please explain the steps taken when finding the inverse of funtions.

1. f(x)= the square root of 'x' (i don't have a square root button on my keyboard)

2. g(x)= 2x+1

I would appreciate if someone could show each step they have taken to get the answer.