Answer
m+n=0 and mn=9
Work Step by Step
$(x+m)(x+n)=x^2+mx+nx+mn=x^2+(m+n)x+mn$
$=x^2+9$
Hence m+n=0 and mn=9
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - P.S. Problem Solving - Page 157: 7a
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