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Defining Homogeneous and Nonhomogeneous Differential Equations

Part of the Differential Equations For Dummies Cheat Sheet

In order to identify a nonhomogeneous differential equation, you first need to know what a homogeneous differential equation looks like. You also often need to solve one before you can solve the other.

Homogeneous differential equations involve only derivatives of y and terms involving y, and they're set to 0, as in this equation:

image0.png

Nonhomogeneous differential equations are the same as homogeneous differential equations, except they can have terms involving only x (and constants) on the right side, as in this equation:

image1.png

You also can write nonhomogeneous differential equations in this format: y'' + p(x)y' + q(x)y = g(x). The general solution of this nonhomogeneous differential equation is

image2.png

In this solution, c1y1(x) + c2y2(x) is the general solution of the corresponding homogeneous differential equation:

image3.png

And yp(x) is a specific solution to the nonhomogeneous equation.

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