Differential Equations

$x^2 \frac{d^2 y}{d x^2}+x \frac{d y}{d x}-2 y=0$

$x^2 \frac{d^2 y}{d x^2}-x \frac{d y}{d x}+2 y=0$

$x^2 \frac{d^2 y}{d x^2}-x \frac{d y}{d x}-2 y=0$

$x^2 \frac{d^2 y}{d x^2}-x \frac{d y}{d x}+y=0$