Answer
$49$
Work Step by Step
$x^2+14x+7^2=(x+7)^2$
$49$ is the term to convert $x^2+14x+$ into perfect square $(x+7)^2$
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 10 - Quadratic Relations and Conic Sections - Get Ready! - Page 611: 13
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