Answer
$(3x+1)^2$
$9x^2+6x+1$
Work Step by Step
Area of largest rectangle:
$(3x+1)(3x+1)=(3x+1)^2$
Sum of areas of smaller rectangles:
$3x(3x)+1(3x)+1(3x)+1(1)$
$=9x^2+3x+3x+1$
$=9x^2+6x+1$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.5 - Multiplying Polynomials - Exercise Set - Page 381: 90
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