Question

12r^2+4r-8

Answer 1

12r^2+4r-8=0? or do you need to decompose?

Answer 2

I need to factor it as a trinomial.

Answer 3

12r^2+4r-8=

12r^2+4r-8=0 than
D=4^2-4*12*(-8)=16+384=400 right?
r1=(-4-20)/24=-1 and r2=(-4+20)/24=16/24=2/3 yup?

12r^2+4r-8=12(r+1)(r-2/3)