Answer
$48xy$
Work Step by Step
$(3x + 4y)^2 - (3x - 4y)^2$
$=(3x + 4y)(3x + 4y)-(3x - 4y)(3x - 4y)$
$=(9x^2+12xy+12xy+16y^2)-(9x^2-12xy-12xy+16y^2)$
$=(9x^2+24xy+16y^2)-(9x^2-24xy+16y^2)$
$=9x^2+24xy+16y^2-9x^2+24xy-16y^2$
$=48xy$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.4 - Polynomials - Exercise Set - Page 56: 83
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