Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 2 - Limits - 2.8 Intermediate Value Theorem - Preliminary Questions - Page 86: 4


If $f (x)$ is continuous and has a root in $[a, b]$, then $f (a)$ and $f (b)$ have opposite signs.

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