Answer
$0$ and $4$
Work Step by Step
Divide the equation by 12,
$12y^{2}-48y=0\qquad.../\div 12$
$ y^{2}-4y=0\qquad$ ... factor out y
$y(y-4)=0$
By the zero product principle,
$y=0$ or $y-4=0$
$y=0$ or $y=4$
The solutions are $0$ and $4$.