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: 2

Answer

$5y +\displaystyle \frac{25}{2}e^{y},\qquad\frac{1}{2}+ex -x$

Work Step by Step

Working on $\displaystyle \int f(x,y)dx$, treat y as a constant. $\displaystyle \int_{0}^{5} (y +xe^{y})dx=[xy +\displaystyle \frac{x^{2}}{2}e^{y}]_{x=0}^{x=5}$ $=(5y +\displaystyle \frac{25}{2}e^{y})-(0+0)$ $=5y +\displaystyle \frac{25}{2}e^{y}$, Working on $\displaystyle \int f(x,y)dy$, treat $x$ as a constant. $\displaystyle \int_{0}^{1} (y +xe^{y})dy =[\displaystyle \frac{y^{2}}{2}+xe^{y}]_{y=0}^{y=1}$ $=(\displaystyle \frac{1}{2}+xe^{1})-(0+xe^{0})$ $=\displaystyle \frac{1}{2}+ex -x$
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