Answer
$x^2-5xy-16y^2$
Work Step by Step
$(8x^2-9xy-11y^2)-(7x^2-4xy+5y^2)=(8-7)x^2+(-9-(-4))xy+(-11-5)y^2=x^2-5xy-16y^2$
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 - Cumulative Review Exercises - Page 660: 20
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