Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter 3 - The Derivative - 3.2 Continuity - 3.2 Exercises - Page 146: 4

Answer

The function $f(x)$ is discontinuous at $x=-2$ and $x=3$ (a) $$ f(-2) =1,\quad f(3) =1 $$ . (b) $$ \lim _{x \rightarrow-2^{-}} f(x)=-1, \quad \lim _{x \rightarrow 3^{-}} f(x)=-1 $$ (c) $$ \lim _{x \rightarrow-2^{+}} f(x)=-1, \quad \lim _{x \rightarrow 3^{+}} f(x)=-1 $$ (d) Since $$ \lim _{x \rightarrow-2^{-}} f(x)=\lim _{x \rightarrow-2^{+}} f(x)=-1 $$ and $$ \lim _{x \rightarrow 3^{-}} f(x)=\lim _{x \rightarrow 3^{+}} f(x)=-1 $$ then, $$ \lim _{x \rightarrow-2} f(x)=-1, \quad \lim _{x \rightarrow 3} f(x)=-1 $$ (e) $$ \lim _{x \rightarrow -2} f(x) \ne f(-2), \quad \lim _{x \rightarrow 3} f(x) \ne f(3). $$

Work Step by Step

The function $f(x)$ is discontinuous at $x=-2$ and $x=3$ (a) $$ f(-2) =1,\quad f(3) =1 $$ . (b) $$ \lim _{x \rightarrow-2^{-}} f(x)=-1, \quad \lim _{x \rightarrow 3^{-}} f(x)=-1 $$ (c) $$ \lim _{x \rightarrow-2^{+}} f(x)=-1, \quad \lim _{x \rightarrow 3^{+}} f(x)=-1 $$ (d) Since $$ \lim _{x \rightarrow-2^{-}} f(x)=\lim _{x \rightarrow-2^{+}} f(x)=-1 $$ and $$ \lim _{x \rightarrow 3^{-}} f(x)=\lim _{x \rightarrow 3^{+}} f(x)=-1 $$ then, $$ \lim _{x \rightarrow-2} f(x)=-1, \quad \lim _{x \rightarrow 3} f(x)=-1 $$ (e) $$ \lim _{x \rightarrow -2} f(x) \ne f(-2), \quad \lim _{x \rightarrow 3} f(x) \ne f(3). $$
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