Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 1 - First-Order Differential Equations - 1.4 Separable Differential Equations - Problems - Page 44: 20

Answer

\[y=\frac{3}{2-x^3}\]

Work Step by Step

Slope of tangent to a curve at ($x,y$) is given by $\frac{dy}{dx}$ at ($x,y$) \[\frac{dy}{dx}=x^2y^2\] Seperating variables \[\frac{dy}{y^2}=x^2 dx\] Integrating, \[\int y^{-2}dy=\int x^2 dx+C\] Where C is constant of integration $\frac{y^{-1}}{-1}=\frac{x^3}{3}+C$ ____(1) Curve passes through $(-1,1)$ \[-1=\frac{-1}{3}+C \Rightarrow C=\frac{-2}{3}\] From (1) \[\frac{-1}{y}=\frac{x^3-2}{3} \Rightarrow y=\frac{3}{2-x^3}\] Hence, equation of curve is $y=\frac{3}{2-x^3}$
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