Math Problem Statement

Use the Laplace transform to solve the following initial value problem: y''-8y'+25y=0, y(0)=0, y'(0)=5 First, using for the Laplace transform of , i.e., , find the equation you get by taking the Laplace transform of the differential equation

Solution

To solve this initial value problem using the Laplace transform, we’ll start by taking the Laplace transform of each term in the differential equation:

Given: y8y+25y=0,y(0)=0,y(0)=5y'' - 8y' + 25y = 0, \quad y(0) = 0, \quad y'(0) = 5

We apply the Laplace transform term by term. Let L{y(t)}=Y(s)\mathcal{L}\{y(t)\} = Y(s).

Step 1: Take the Laplace Transform of Each Term

  1. Transform of yy'': L{y}=s2Y(s)sy(0)y(0)\mathcal{L}\{y''\} = s^2 Y(s) - s y(0) - y'(0) Substituting y(0)=0y(0) = 0 and y(0)=5y'(0) = 5: L{y}=s2Y(s)5\mathcal{L}\{y''\} = s^2 Y(s) - 5

  2. Transform of 8y-8y': L{8y}=8(sY(s)y(0))\mathcal{L}\{-8y'\} = -8(s Y(s) - y(0)) Since y(0)=0y(0) = 0: L{8y}=8sY(s)\mathcal{L}\{-8y'\} = -8s Y(s)

  3. Transform of 25y25y: L{25y}=25Y(s)\mathcal{L}\{25y\} = 25Y(s)

Step 2: Substitute and Form the Equation

Substituting each transformed term into the differential equation: (s2Y(s)5)8sY(s)+25Y(s)=0(s^2 Y(s) - 5) - 8s Y(s) + 25 Y(s) = 0

Combine like terms: (s28s+25)Y(s)=5(s^2 - 8s + 25) Y(s) = 5

Thus, the equation we get by taking the Laplace transform of the differential equation is: (s28s+25)Y(s)=5(s^2 - 8s + 25) Y(s) = 5

Would you like to proceed with solving for Y(s)Y(s) or need further clarification on these steps?

Here are five related questions:

  1. What is the next step to isolate Y(s)Y(s) in the equation?
  2. How do we find the inverse Laplace transform of Y(s)Y(s) once it's isolated?
  3. What role do initial conditions play in transforming the differential equation?
  4. How does the characteristic equation help when solving with Laplace transforms?
  5. What methods are used to simplify expressions in the Laplace domain?

Tip: When using Laplace transforms, always check if initial conditions can simplify the transformed expressions.

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Math Problem Analysis

Mathematical Concepts

Differential Equations
Laplace Transforms
Initial Value Problems

Formulas

Laplace transform of y'': L{y''} = s^2 Y(s) - s y(0) - y'(0)
Laplace transform of y': L{y'} = s Y(s) - y(0)
Laplace transform of y: L{y} = Y(s)

Theorems

Laplace Transform Theorem
Linear Property of Laplace Transforms

Suitable Grade Level

Undergraduate