Respostas

2014-05-13T10:44:42-03:00
X²=3x+18
x²-3x-18=0
D= (-3)²-4.1.-18
D=9+72
D=81
x=-B+-raiz 81/2A
x¹=3+9/2= 12/2= 6
x²=3-9/2=-6/2= -3