Difference Quotient?

Question

Find and then simplify the Difference Quotient for the following functions:

1. f(x) = 4x - 2
2. f(x) = 5/( x + 2)
3. f(x) = sqrt(2x - 3)

If at all possible, please work out the steps too. It wont do me much good to just have the answers. Its been a while since Ive had to do this.

Answer 1

1. (4(x + h) - 2 - (4x - 2))/h
...(4x + 4h - 2 - 4x + 2)/h
...4h/h
...4

2. (5/( x + h + 2) - 5/( x + 2))/h
...(5(x +2) - 5(x + h + 2))/(h(x + h + 2)(x + 2))
...-5/((x + h + 2)(x + 2))

3. (sqrt(2(x - h) - 3) - sqrt(2x - 3))/h
...(sqrt(2x - 2h - 3) - sqrt(2x - 3))/h
...?