Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 11 - Multiple Integrals - 15.2 Exercises - Page 1011: 16

Answer

$4$

Work Step by Step

$\displaystyle \iint_{R}(y+xy^{-2})dA=\int_{1}^{2}\int_{0}^{2}(y+xy^{-2})dxdy=\int_{1}^{2}[\int_{0}^{2}(y+xy^{-2})dx]dy$ $\left[\begin{array}{l} \text{... treat y as a constant in the inner integral} \\ \displaystyle\int_{0}^{2}(y+xy^{-2})dx=[xy+\frac{y^{-2}}{2}x^{2}]_{x=0}^{x=2}=\\ \\ =2y+\dfrac{4y^{-2}}{2}\\\\ =2y+2y^{-2} \end{array}\right]$ $=\displaystyle \int_{1}^{2}(2y+2y^{-2})dy$ $=[y^{2}-2y^{-1}]_{1}^{2}$ $=(4-1)-(1-2)$ $=4$
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