Answer
$c=100$
Work Step by Step
The value of $b$ is 2. The term to add to $x^2+20x$ is $(\frac{20}{2})^2=100$. So $c=100$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 9 - Quadratic Functions and Equations - 9-5 Completing the Square - Got It? - Page 577: 1
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