1. **State the problem:** Solve the differential equation $$x^2 y'' - 4x y' + 6y = 4x - 6$$ using the method of variation of parameters or a similar method.
2. **Identify the type of equation:** This is a Cauchy-Euler (or equidimensional) differential equation. The associated homogeneous equation is $$x^2 y'' - 4x y' + 6y = 0$$.
3. **Solve the homogeneous equation:** Assume a solution of the form $$y = x^m$$.
Substitute into the homogeneous equation:
$$x^2 (m(m-1)x^{m-2}) - 4x (m x^{m-1}) + 6 x^m = 0$$
Simplify:
$$m(m-1) x^m - 4m x^m + 6 x^m = 0$$
$$x^m [m(m-1) - 4m + 6] = 0$$
$$m^2 - m - 4m + 6 = 0$$
$$m^2 - 5m + 6 = 0$$
4. **Solve the characteristic equation:**
$$m^2 - 5m + 6 = 0$$
Factor:
$$(m-2)(m-3) = 0$$
So, $$m = 2$$ or $$m = 3$$.
5. **General solution to homogeneous equation:**
$$y_h = C_1 x^2 + C_2 x^3$$
6. **Find a particular solution $$y_p$$:** Use variation of parameters or method of undetermined coefficients.
Since the right side is $$4x - 6$$, try a particular solution of the form:
$$y_p = A x + B$$
7. **Compute derivatives:**
$$y_p' = A$$
$$y_p'' = 0$$
8. **Substitute into original equation:**
$$x^2 (0) - 4x (A) + 6 (A x + B) = 4x - 6$$
Simplify:
$$-4 A x + 6 A x + 6 B = 4 x - 6$$
$$ (2 A) x + 6 B = 4 x - 6$$
9. **Equate coefficients:**
For $$x$$ terms:
$$2 A = 4 \\ A = 2$$
For constants:
$$6 B = -6 \\ B = -1$$
10. **Particular solution:**
$$y_p = 2 x - 1$$
11. **General solution:**
$$y = y_h + y_p = C_1 x^2 + C_2 x^3 + 2 x - 1$$
Cauchy Euler Solve 1059Bc
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