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: 34

Answer

L=-4, 𝛿 = 0.05

Work Step by Step

L=$\lim\limits_{x \to -5} \frac{x^{2} +6x+5}{x+5}$ = $\lim\limits_{x \to -5}\frac{(x+5)(x+1)}{x+5}$ =$\lim\limits_{x \to -5} x+1$ =-5+1 = -4 Solve the inequality |f(x) -L| < e In the above calculation we concluded = $ \frac{x^{2} +6x+5}{x+5}$ = x+1 |x+1 +4 | <0.05 |x+5| <0.05 -0.050; Now we need to find the value of 𝛿>0 that places the open interval (-5-𝛿, -5+𝛿) centered at -5 inside the interval(-5.05, -4.95). distance between -5 and -5.05 is 0.05 and distance between -5 and -4.95 is 0.05. so we will take the smaller value for 𝛿, so 𝛿 = 0.05
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