Answer
$9x^{2}+15x+4$
Work Step by Step
Apply the FOIL method
First$:\qquad 3x(3x)=9x^{2}$
Outer:$\qquad 3x(1)=3x$
Inner:$\qquad 4(3x) =12x$
Last:$\qquad 4(1) = 4$
Adding like terms, $3x+12x=15x,$
result = $9x^{2}+15x+4$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 6 - Section 6.2 - Factoring Trinomials Whose Leading Coefficient is 1 - Exercise Set - Page 437: 111
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