Answer
$=\left( 2z+7\right) ^{2}$
Work Step by Step
$4z^{2}+28z+49=\left( 2z\right) ^{2}+2\times \left( 2z\right) \times 7+7^{2}=\left( 2z+7\right) ^{2}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.4 Factoring Polynomials - R.4 Exercises - Page 44: 101
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