How do I find the difference quotient

Question

f(x)=2x^2-4x

Answer 1

start with f(x+h)

f(x+h)=2(x+h)^2 - 4(x+h)
work that out, then
f(x)=2x^2-4x

Then subtract f(x) from f(x+h). then divide by h.
http://www.analyzemath.com/calculus/Differentiation/difference_quotient.html

Answer 2

I got 8x+2h is that correct?

Answer 3

no wait...I did that wrong. I forgot a step.

Answer 4

is the answer
2x+h+2