Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 1 - Limits and Continuity - 1.1 Limits (An Intuitive Approach) - Exercises Set 1.1 - Page 60: 20

Answer

False

Work Step by Step

Observe Figure Ex-9 at $x=2$. The right-hand-side limit is $-\infty$, since the function decreases asymptotically from that side towards $x=2$. However, we can see a filled-in dot on the $x=2$ line, so $f(2)$ has a value and is not undefined. This is possible because functions that are discontinuous do not always have any similarity between the limit values and the actual values at a point. The value of $f(a)$ can be anything, no matter the value of the right-hand-limit, if the function is discontinuous.
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