calculus
posted by vicki
f(x)=X^3, f(a+h)f(a)/h
please help im so lost
thanks

Reiny
(a+h)^3 = a^3 + 3a^2h + ah^2 + h^3)
so [f(a+h)  f(a)]/h
= [a^3 + 3a^2h + 3ah^2 + h^3  a^3]/h
= 3a^2 + 3ah + h^2
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