Answer
$25$
Work Step by Step
$x^2+10x=x^2+2\cdot5\cdot x$ so the half of the coefficient of $x$ is $5$. Thus to complete the square we must add $5^2=25$.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 8 - Section 8.1 - The Square Root Property and Completing the Square - Concept and Vocabulary Check - Page 592: 5
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