Differential Equation - Linear Equations (Non - Homogeneous)

In summary, the conversation discusses finding the general solution for the given differential equation, with the focus on the right side of the equation. The attempted solution involves finding the particular solution and solving for the constants a, b, and c. The conversation ends with the suggestion to substitute the values back in to check if the solution is correct.
  • #1
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Homework Statement



Find the general solution of [tex]\frac{dy}{dt} + 2y = 3t^2 + 2t -1[/tex]

Homework Equations





The Attempt at a Solution



So just worrying about the right side

[tex]y_p = at^2 + bt + c[/tex]

so [tex]\frac{dy_p}{dt} + y_p = 2at + b +at^2 + bt + c = 3t^2+2t - 1[/tex]

[tex]at^2 = 3t^2 \rightarrow a =3[/tex]
[tex]2(3)t + bt = 2t \rightarrow b = -4[/tex]
[tex](-4) + c = -1 \rightarrow c = 3[/tex]

Is that part right?
 
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  • #2
Is that part right?

Substitute it back in and see if it is right? Far better that you learn to check it yourself than for you to ask someone else if it is right.
 
  • #3
Dr.D said:
Substitute it back in and see if it is right? Far better that you learn to check it yourself than for you to ask someone else if it is right.

God, why didn't I think of that? Thank you.
 

1. What is a non-homogeneous linear differential equation?

A non-homogeneous linear differential equation is a type of differential equation where the dependent variable and its derivatives are multiplied by non-zero functions. It can be written in the form of y'' + p(x)y' + q(x)y = f(x), where p(x) and q(x) are functions of x and f(x) is a non-zero function.

2. How do you solve a non-homogeneous linear differential equation?

To solve a non-homogeneous linear differential equation, you can use the method of undetermined coefficients or variation of parameters. The method of undetermined coefficients involves guessing a particular solution based on the form of f(x), while variation of parameters involves finding a general solution by integrating a linear combination of the homogeneous solution and a particular solution.

3. What is the role of initial conditions in solving a non-homogeneous linear differential equation?

The initial conditions, also known as boundary conditions, are necessary to determine the particular solution in the method of undetermined coefficients. They can also be used to find the constants in the general solution of a non-homogeneous linear differential equation.

4. Can a non-homogeneous linear differential equation have multiple solutions?

Yes, a non-homogeneous linear differential equation can have multiple solutions. This is because the general solution is a combination of the homogeneous solution and a particular solution, and there can be multiple choices for the particular solution.

5. What are the applications of non-homogeneous linear differential equations?

Non-homogeneous linear differential equations are often used to model real-world phenomena in physics, engineering, and economics. They can be used to describe growth and decay processes, electrical circuits, and population dynamics, among others.

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