Answer
$$A=w^2+3w$$
Work Step by Step
The perimeter is the sum of the side lengths. Thus, the perimeter is:
$$ w+3+w+3+w+w \\ 4w+6$$
Using the equation for the area of a rectangle, we find:
$$ A=w(w+3) \\ A=w^2+3w$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 4 - Polynomials - Review Exercises: Chapter 4 - Page 299: 46
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