Respostas

2014-04-23T16:23:23-03:00
X(x-2)=3(x+6)=x-2x=3x+18=-1x-3x=18=-4x=18=x18/-4
2014-04-23T16:36:32-03:00
X²-2x=3x+18
x²-2x-3x+18=0
x²-5x+18=0
Δ=b²-4.a.c
Δ=(-5)²-4.1.18
Δ=25-72
Δ=-47 (não possui raiz quadrada exata)