Answer
$51x^2+31x-5$
Work Step by Step
Use the FOIL method on the second and third sets of parentheses. Then combine like terms.
$(2x^2+3x-9)+(7x+2)^2$
$=(2x^2+3x-9)+(7x+2)(7x+2)$
$=(2x^2+3x-9)+(49x^2+28x+4)$
$=51x^2+31x-5$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 3 - Exponents, Polynomials and Functions - 3.2 Combining Functions - 3.2 Exercises - Page 244: 45
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