- #1
Precal_Chris
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Homework Statement
Use the limit definition to find the derivative at the indicated point.
f(x)= -x^3+4x^2, at (-1,5)
Homework Equations
f(a)=lim x->1 (f(x)-f(a))/(x-(a))
The Attempt at a Solution
ok so i got:
f'(-1)=(lim x->1) ((-x^3)+(4x^2)- f(-1))/(x-(-1))
f(-1)= (lim x->1) ((-x^3)+(4x^2)- f(-1))/(x+1)
my only question is .. what would f(-1) be..?
is this right?:
(1^3)-(4^2)
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