Answer
$A = 3w^2$
Work Step by Step
Area of a rectangle is length x width
In the problem, it is given that the length is 3 times the width
Thus $l = 3w$
$A = lw$
$A = (3w)w$
$A = 3w^2$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 2 - Review - Modeling with Functions - Problems - Page 240: 1
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