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: 36

Answer

L=2, 𝛿 =0.333

Work Step by Step

L = $\lim\limits_{x \to 2} \frac{4}{x}$ = $ \frac{4}{2}$ = 2 Solve the inequality |f(x) -L| < e |$\frac{4}{x}$ -2| <0.4 -0.4 0; Now we need to find the value of 𝛿>0 that places the open interval (2-𝛿, 2+𝛿) centered at 2 inside the interval (1.667, 2.5). distance between 1.667 and 2 is 0.333 and distance between 2 and 2.5 is 0.5. so we will take the smaller value for 𝛿, so 𝛿 =0.333
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