Sing the definition of the derivative, find f'(x). then find f'(1), f'(2), and f'(3)when the derivative exists. f(x)=-x^2+4x-9

By definition of the derivative, and with , we have

In this case,

Then

so that as , we're left with

and so

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step-by-step explanation:

the answer is 8/21

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