#### Answer

true.

#### Work Step by Step

This statement is true, because the Descartes’s Rule of Signs clearly states that if the function $f(x)$ will have only one sign change, then there will be exactly one positive real zero.

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Published by
Pearson

ISBN 10:
0-13446-914-3

ISBN 13:
978-0-13446-914-0

true.

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