Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 13 - Multiple Integration - Review Exercises - Page 1046: 8

Answer

\[A=12\]

Work Step by Step

\[\begin{align} & \text{From the graph, the area is given by:} \\ & A=\int_{-2}^{0}{\int_{-x-4}^{x}{dy}dx}+\int_{0}^{4}{\int_{2x-4}^{x}{dy}dx} \\ & \text{Integrating} \\ & A=\int_{-2}^{0}{\left( x+x+4 \right)dx}+\int_{0}^{4}{\left( x-2x+4 \right)dx} \\ & A=\int_{-2}^{0}{\left( 2x+4 \right)dx}+\int_{0}^{4}{\left( 4-x \right)dx} \\ & A=\left[ {{x}^{2}}+4x \right]_{-2}^{0}+\left[ 4x-\frac{1}{2}{{x}^{2}} \right]_{0}^{4} \\ & A=\left[ 0 \right]-\left[ {{\left( -2 \right)}^{2}}+4\left( -2 \right) \right]+\left[ 4\left( 4 \right)-\frac{1}{2}{{\left( 4 \right)}^{2}} \right]-\left[ 0 \right] \\ & A=4+8 \\ & A=12 \\ \end{align}\]
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