Answer
$4$
Work Step by Step
Let the value in the box be $y$. Based on the FOIL method, we need $3y=12$, which gives $y=4$.
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 58: 111
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