calculus

For a function f, let
f*(x)=lim (f(x+h)-f(x-h))/h
h->0
Determine f*(x) for f(x)=(x^2)+x

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  1. f(x+h)=(x+h)^2+x+h=x^2+2xh+h^2+x-h
    do the same for x-h
    then subtract, divide by h.

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