#### 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:

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

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

See the graph below:

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