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: 10

Answer

\[A=\frac{9}{8}\]

Work Step by Step

\[\begin{align} & \text{Let }y=1+x-{{x}^{2}}\text{ and }y={{x}^{2}} \\ & \text{From the graph, the area is given by:} \\ & A=\int_{-1/2}^{1}{\int_{{{x}^{2}}}^{1+x-{{x}^{2}}}{dy}dx} \\ & \text{Integrating} \\ & A=\int_{-1/2}^{1}{\left( 1+x-{{x}^{2}}-{{x}^{2}} \right)dx} \\ & A=\int_{-1/2}^{1}{\left( 1+x-2{{x}^{2}} \right)dx} \\ & A=\left[ x+\frac{1}{2}{{x}^{2}}-\frac{2}{3}{{x}^{3}} \right]_{-1/2}^{1} \\ & A=\left[ \left( 1 \right)+\frac{1}{2}{{\left( 1 \right)}^{2}}-\frac{2}{3}{{\left( 1 \right)}^{3}} \right]-\left[ \left( -\frac{1}{2} \right)+\frac{1}{2}{{\left( -\frac{1}{2} \right)}^{2}}-\frac{2}{3}{{\left( -\frac{1}{2} \right)}^{3}} \right] \\ & A=\frac{5}{6}+\frac{7}{24} \\ & A=\frac{9}{8} \\ \end{align}\]
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