Question

Question about this simplifying?

Answer 1

Question is f(x+h)-f(x)/h and f(x)=-2x^2, solve for difference quotient.

Answer 2

So I got -2(x+h)^2-2x^2/h, and got -2x^2-2h^2-2x^2/h.
-4x^2-2h^2/h
-4x^2-2h

Answer 3

But my book says it is -4x-2h

Answer 4

the answer should be -4x-2h

Answer 5

Yeah, why?

Answer 6

Where is this simplifying of x^2 coming from?

Answer 7

(-2x^2-2h^2-2x^2)/h is incorrect

Answer 8

you need to expand the first term using foil

Answer 9

-2(x+h)^2=-2x^2-4xh-2h^2

Answer 10

note how -2x^2 cancels out

Answer 11

OH I see what the hell I'm doing wrong..