sketch the graph of the following equation

$\displaystyle y= 6-10x-4x^2 $

I rearranged the equation to $\displaystyle y= -4x^2 -10x +6 $

but i am stuck here cause can't seem to factor the equation, and i am not meant to use the quadratic equation or completing the square.

how do i facto this?

i tried $\displaystyle (2x-3) ( -2x-2) =0 $ but that does not work