Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 4 - Applications of the Derivative - 4.7 L'Hopital's Rule - 4.7 Exercises - Page 307: 2

Answer

Because they transform indeterminate forms into determinate forms that can be evaluated.

Work Step by Step

The method of straightaway substitution won't work if we get an indeterminate form. Then we use some special method to transform the limit such that if we substitute after this transformation we get a determinate form which can be evaluated.
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