College Algebra 7th Edition

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: 2


$A(w)=w^{2}+10w$, $w\gt 0$

Work Step by Step

We are told that the poster has length 10 inches longer than the width ($l=w+10$). Therefore, the area is: Area=length*width=$l*w=(w+10)w=w^2+10w$ We should restrict $w\gt 0$, since the width can't be negative.
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