Respostas

2014-08-17T15:17:32-03:00
3x²+5x=-x-9+2x²
3x²+5x+x+9-2x²=0
X²+6x+9=0
Δ=6²-4.1.9
Δ=36-36
Δ=0
X=-6±√Δ/2.1
X=-6±√0/2
X'=-6+0/2=-3
X"=-6-0/2=-3
S{-3}
2 5 2