$\displaystyle 2y^(^3^) + 9y" + 12y' + 5y =0$

Tried using an auxiliary equation:

$\displaystyle 2m^3 + 9m^2 + 12m + 5 = 0$

Not sure how to factor that so I don't know where to go from there, I feel like I might be missing something obvious, any help is appreciated