Answer
If $f (x)$ is continuous and has a root in $[a, b]$, then $f (a)$ and $f (b)$ have opposite signs.
Work Step by Step
See the graph below:
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
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
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