University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 16 - Section 16.2 - First-Order Linear Equations - Exercises - Page 16-14: 16

Answer

$y=\dfrac{t^3}{5}-\dfrac{12t^{-2}}{5}$

Work Step by Step

The standard form of the given equation is: $ty'+2y=t^3$ ....(1) The integrating factor is: $e^{\int (2/t) dt}=t^2$ In order to determine the general solution, multiply equation (1) with the integrating factor and integrate both sides. $\int [t^2y]' dt=\int t^4$ or, $t^2y=\dfrac{t^5}{5}+c$ Applying the initial conditions in the above equation, we get $(1)(2^2)=\dfrac{(2)^5}{5}+c \implies c=-\dfrac{12}{5}$ and $t^2y=\dfrac{t^5}{5}-\dfrac{12}{5}$ Thus, the general solution is as follows: $y=\dfrac{t^3}{5}-\dfrac{12t^{-2}}{5}$
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