Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 2 - Limits - 2.3 Techniques for Computing Limits - 2.3 Exercises - Page 76: 7

Answer

$p(0)=20$

Work Step by Step

Theorem 2.3.5. Quotient rule: $\displaystyle \lim_{x\rightarrow a}\left(\frac{f(x)}{g(x)}\right)=\frac{\lim_{x\rightarrow a}f(x)}{\lim_{x\rightarrow a}g(x)},$ provided lim $g(x)\neq 0$ --- $\displaystyle \lim_{x\rightarrow 0}\frac{p(x)}{q(x)}=\frac{\lim_{x\rightarrow 0}p(x)}{\lim_{x\rightarrow 0}q(x)}$ $10=\displaystyle \frac{\lim_{x\rightarrow 0}p(x)}{2}$ $20=\displaystyle \lim_{x\rightarrow 0}p(x)$ Since $p(x)$ is a polynomial, by Th.2.4, $\displaystyle \lim_{x\rightarrow 0}p(x)=p(0)=20$
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