16x^2-240-32=0? Can someone check my answer? What am I doing wrong?

I got( -1,2)

Question

16x^2-240-32=0? Can someone check my answer? What am I doing wrong?

I got( -1,2)

anonymous · Answer

16(x^2-15-2)=0
(x+1)(x-2)

inkyvoyd · Answer

You factored the equation incorrectly.

anonymous · Answer

how so?

inkyvoyd · Answer

(x+1)(x-2)=x^2-2x-2.

inkyvoyd · Answer

you'll have to use the quadratic equation for this one I believe, as b^2-4ac is not a perfect square.

inkyvoyd · Answer

*formula I mea

anonymous · Answer

I did- see this is what I had

16x^2-240-32x=0
then
16(x^2-15-2)=0 
then divid each side by 16
then
this is where I had problems

inkyvoyd · Answer

what do you mean exactly? that was correct, but 
16(x^2-15-2)=0 
x^2-15-2=0
at this point you factored the equation incorrectly. You must use the quadratic equation for this one.

anonymous · Answer

attachment

anonymous · Answer

Thanks for your help. The answer was actually 3, -5