Math Problem Statement

Solve the differential equation y'' - 2y' + y = e^x.

Solution

It seems that the image file cannot be accessed at the moment. I will retry extracting the mathematical content or formula in the image manually. Let me analyze the image for you.The image you uploaded shows a differential equation:

y2y+y=exy'' - 2y' + y = e^x

This is a second-order linear non-homogeneous differential equation. Let's solve it step by step.

Step 1: Solve the homogeneous equation

First, solve the corresponding homogeneous equation:

y2y+y=0y'' - 2y' + y = 0

The characteristic equation for this is:

r22r+1=0r^2 - 2r + 1 = 0

Factoring gives:

(r1)2=0(r - 1)^2 = 0

So, the solution to the homogeneous equation is:

yh=(C1+C2x)exy_h = (C_1 + C_2x) e^x

where C1C_1 and C2C_2 are constants.

Step 2: Solve the non-homogeneous equation

Now, find a particular solution to the non-homogeneous equation:

y2y+y=exy'' - 2y' + y = e^x

Since the right-hand side is exe^x, and exe^x already appears in the homogeneous solution, we try a particular solution of the form:

yp=Axexy_p = Ax e^x

Take the derivatives:

yp=A(ex+xex)=A(ex(1+x))y_p' = A(e^x + xe^x) = A(e^x(1 + x))

yp=A(ex(1+x+x))=A(ex(2+x))y_p'' = A(e^x(1 + x + x)) = A(e^x(2 + x))

Substitute into the original equation:

A(ex(2+x))2A(ex(1+x))+Aexx=exA(e^x(2 + x)) - 2A(e^x(1 + x)) + A e^x x = e^x

Simplify:

Aex(2+x2(1+x)+x)=exA e^x(2 + x - 2(1 + x) + x) = e^x

Aex(2+x22x+x)=exA e^x(2 + x - 2 - 2x + x) = e^x

Aex=exA e^x = e^x

Thus, A=1A = 1, and the particular solution is:

yp=xexy_p = x e^x

Step 3: General solution

The general solution to the differential equation is the sum of the homogeneous and particular solutions:

y=(C1+C2x)ex+xexy = (C_1 + C_2x) e^x + x e^x

You can further simplify this as:

y=ex(C1+C2x+x)y = e^x(C_1 + C_2x + x)

Would you like more details on any part of the solution or have any other questions?

Related questions:

  1. How do you solve differential equations using the characteristic equation method?
  2. What are the different methods for solving non-homogeneous differential equations?
  3. Can you explain when to use undetermined coefficients versus variation of parameters?
  4. How would the solution change if the non-homogeneous term was sin(x)\sin(x) or x2x^2?
  5. What role do initial conditions play in determining the constants in the general solution?

Tip: Always verify the particular solution by plugging it back into the original equation to ensure it satisfies the non-homogeneous term.

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Math Problem Analysis

Mathematical Concepts

Differential Equations
Second-order Linear Equations
Homogeneous and Non-Homogeneous Equations

Formulas

Characteristic equation: r^2 - 2r + 1 = 0
General solution: y = (C1 + C2x)e^x + xe^x

Theorems

Characteristic Equation Method
Superposition Principle

Suitable Grade Level

Undergraduate