Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 9 - Section 9.2 - Solving Quadratic Equations by Completing the Square - Concept and Vocabulary Check - Page 638: 6

Answer

100

Work Step by Step

The coefficient of x is 20. Adding the square of half the coefficient creates a perfect square. $(20\div2)^2=10^2=100$
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