Question

f(x)=x^2+4
f(x+h)-f(x)/h
Solve function.
...Everything seems to cancel out for me. Don't know why.

Answer 1

[(x+h)^2+4-x^2-4]/h
[x^2+2hx+h^2+4-x^2-4]/h
[2hx+h^2]/h
2x+h

Answer 2

Thanks! Could you help me with one more?