Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 2: Limits and Continuity - Section 2.3 - The Precise Definition of a Limit - Exercises 2.3 - Page 66: 31

Answer

$L = -3, 𝛿 = 0.01$

Work Step by Step

Solve the inequality $|f(x) -c| < \epsilon$, where $c=-3$ and $\epsilon=0.02$: $|3-2x+3| <0.02$ $|6-2x| <0.02$ $-0.02<6-2x<0.02$ $5.98<2x<6.02$ $2.990$ that places the open interval $(3-\delta, 3+\delta)$ centered at $3$ inside the interval $(2.99, 3.01)$. The distance between $3$ and $2.99$ is $0.01$ and distance between $3$ and $3.01$ is $0.01$. so we will take the smaller value for $\delta$, so $\delta = 0.01$ The limit is $L=3$.
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