Question

For f(x)=-x^2-4x-1, find f(x+h)-f(x)/h.

I keep doing it but I'm getting the wrong answer, any help?:)

Answer 1

go slow

Answer 2

first find \(f(x+h)\)

Answer 3

Is this what you're starting with for f(x+h)?
\[f(x+h)=(x+h)^2-4(x+h)-1\]

Answer 4

Oops, sorry, I missed the negative sign out in front...

Answer 5

\[f(x+h)=-(x+h)^2-4(x+h)-1\]

Answer 6

@satellite73 for f(x+h) I get:
-x^2-2hx-4x-h^2-4h-1

Answer 7

looks good
now subtract \(f(x)\)

Answer 8

everything without an \(h\) should be gone when you are done