Answer
$A(w)=3w^{2}$
$w\gt 0$
Work Step by Step
We are told that the building has length three times the width ($l=3w$). Therefore, the area is:
Area=length*width=$l*w=3w*w=3w^2$
We should restrict $w\gt 0$, since the width can't be negative.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 2, Functions - Focus on Modeling - Modeling with Functions - Problems - Page 276: 1
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