Respostas

2014-07-23T18:13:58-03:00
4x²+9=12x
4x²+9-12x=0

∆=b²-4.a.c
∆=-144-4.4.9
∆=-288
∆=288

x=-12±√288/8
x1=-12+17/8=5/8
x2=-12-17/8=-29/8
6 3 6