Solving the Homogeneous and Non-Homogeneous Linear Differential Equation
When dealing with differential equations, understanding both the homogeneous and non-homogeneous solutions is crucial for comprehensively solving problems. In this article, we will walk through the process of finding the solution to a specific differential equation, illustrating the steps involved in both the homogeneous and non-homogeneous cases.
Introduction to the Differential Operator
Let us begin by setting up a differential equation of the form:
(D^2 - 4D 4Y 8x^2)D^2 - 4D 4Y 8x^2
Here, [D frac{d}{dx}] (the differential operator).
Homogeneous Part of the Differential Equation
1. Finding the Homogeneous Solution
First, we need to solve the homogeneous part of the equation:
[D^2 - 4D 4Y 0]D^2 - 4D 4Y 0
This is a second-order linear homogeneous differential equation. We can solve this by finding the roots of the characteristic equation:
[r^2 - 4r 4 0]r^2 - 4r 4 0
Factoring the quadratic equation:
[(r - 2)^2 0](r - 2)^2 0
The roots of the equation are [r 2], which are real and equal. Thus, the complementary function (the general solution to the homogeneous equation) is:
[y_h a e^{-2x} b x e^{-2x}]y_h a e^{-2x} b x e^{-2x}
Non-Homogeneous Part of the Differential Equation
2. Finding the Particular Integral
Next, we need to find the particular integral of the given non-homogeneous differential equation:
[D^2 - 4D 4Y 8x^2)D^2 - 4D 4Y 8x^2)
To find the particular integral, we propose a form for [Y_p] based on the highest power and the coefficients of the non-homogeneous term. In this case, we choose:
[Y_p ax^2 bx c]Y_p ax^2 bx c
Let us substitute this form into the differential equation:
[D^2(ax^2 bx c) 2a]D^2(ax^2 bx c) 2a
[D(2ax b) 2a)D(2ax b) 2a)
[4a(2ax b) 8ax 4b]4a(2ax b) 8ax 4b)
Equating coefficients, we get:
From [2a 8x], we obtain [a 4x].
From [4b 8x^2], we obtain [b 2x^2].
From [4c 0], we obtain [c 0].
Thus, the particular integral is:
[Y_p 2x^2 - 4x 3]Y_p 2x^2 - 4x 3
General Solution of the Differential Equation
The general solution of the differential equation is the sum of the complementary function and the particular integral:
[y y_h Y_p a e^{-2x} b x e^{-2x} 2x^2 - 4x 3)y y_h Y_p a e^{-2x} b x e^{-2x} 2x^2 - 4x 3)
Applying Initial Conditions
To determine the specific values of the constants [a] and [b], we use the initial conditions given in the problem:
[y1] at [x0]y1) at (x0
Substituting [y a e^{-2(0)} b (0) e^{-2(0)} 2(0)^2 - 4(0) 3 1], we get:
[a 3 1]a 3 1
Solving for [a], we obtain:
[a -2]a -2
Conclusion
In summary, the solution to the differential equation [D^2 - 4D 4Y 8x^2] (with the given initial condition) is:
[y -2 e^{-2x} b x e^{-2x} 2x^2 - 4x 3]y -2 e^{-2x} b x e^{-2x} 2x^2 - 4x 3
To find the value of [b], we would differentiate the solution and substitute the appropriate condition, but since the problem does not provide a second condition, we leave it in terms of [b].