Linear Second Order ODE/2 x^2 y'' + 10 x y' + 8 y = 0

Theorem
The second order ODE:
 * $(1): \quad 2 x^2 y'' + 10 x y' + 8 y = 0$

has the general solution:
 * $y = C_1 x^{-2} + C_2 x^{-2} \ln x$

Proof
Let $(1)$ be rewritten as:
 * $x^2 y'' + 5 x y' + 4 y = 0$

It can be seen to be an instance of the Cauchy-Euler Equation:
 * $x^2 y'' + p x y' + q y = 0$

where:
 * $p = 5$
 * $q = 4$

By Conversion of Cauchy-Euler Equation to Constant Coefficient Linear ODE, this can be expressed as:
 * $\dfrac {\d^2 y} {\d t^2} + \paren {p - 1} \dfrac {\d y} {\d t^2} + q y = 0$

by making the substitution:
 * $x = e^t$

Hence it can be expressed as:
 * $(2): \quad \dfrac {\d^2 y} {\d t^2} + 4 \dfrac {\d y} {\d t^2} + 4 y = 0$

From Linear Second Order ODE: $y'' + 4 y' + 4 y = 0$, this has the general solution: