Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.4 - Polynomials - Exercise Set - Page 57: 107

Answer

$x^2+2x$

Work Step by Step

Step 1. Cut the area into two rectangles as shown in the figure. Step 2. Find the width of the left rectangle to be $x+3-x=3$ Step 3. The total area is the sum of the areas of the two rectangles; we have $A=3x+x(x-1)=x^2+2x$
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