Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 2 - Differentiation - 2.1 Exercises - Page 104: 67

Answer

$f'(-2)=4$

Work Step by Step

$f(x)=x^3+2x^2+1$ $f'(c)=\lim\limits_{x \to c}\frac{f(x)-f(c)}{x-c}$ $f'(-2)=\lim\limits_{x \to -2}\frac{x^3+2x^2+1-((-2)^3+2(-2)^2+1))}{x-(-2)}$ $f'(-2)=\lim\limits_{x \to -2}\frac{x^3+2x^2}{x+2}$ $f'(-2)=\lim\limits_{x \to -2}\frac{(x^2)(x+2)}{x+2}$ $f'(-2)=\lim\limits_{x \to -2}x^2$ $f'(-2)=4$
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