Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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**Consider the Differential Equation:**

\[ 2y'' + ty' - 2y = 14, \quad y(0) = y'(0) = 0. \]

In some instances, the Laplace transform can be used to solve linear differential equations with variable monomial coefficients. Use Theorem 7.4.1.

**THEOREM 7.4.1 Derivatives of Transforms**

If \( F(s) = \mathcal{L}\{t^n f(t)\} \) and \( n = 1, 2, 3, \ldots \), then

\[ \mathcal{L}\{t^n f(t)\} = (-1)^n \frac{d^n}{ds^n} F(s), \]

to reduce the given differential equation to a linear first-order differential equation in the transformed function \( Y(s) = \mathcal{L}\{y(t)\}. \)

**Solve the first-order DE for \( Y(s) \):**

\[ Y(s) = \boxed{\phantom{answer\ here}} \]

**Then find \( y(t) = \mathcal{L}^{-1}\{Y(s)\} \):**

\[ y(t) = \boxed{\phantom{answer\ here}} \]
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Transcribed Image Text:**Consider the Differential Equation:** \[ 2y'' + ty' - 2y = 14, \quad y(0) = y'(0) = 0. \] In some instances, the Laplace transform can be used to solve linear differential equations with variable monomial coefficients. Use Theorem 7.4.1. **THEOREM 7.4.1 Derivatives of Transforms** If \( F(s) = \mathcal{L}\{t^n f(t)\} \) and \( n = 1, 2, 3, \ldots \), then \[ \mathcal{L}\{t^n f(t)\} = (-1)^n \frac{d^n}{ds^n} F(s), \] to reduce the given differential equation to a linear first-order differential equation in the transformed function \( Y(s) = \mathcal{L}\{y(t)\}. \) **Solve the first-order DE for \( Y(s) \):** \[ Y(s) = \boxed{\phantom{answer\ here}} \] **Then find \( y(t) = \mathcal{L}^{-1}\{Y(s)\} \):** \[ y(t) = \boxed{\phantom{answer\ here}} \]
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