Respostas

2014-02-11T14:04:18-02:00
2x² + 5x=3= 2x²+5x-3=0 a=2 ; b=5 ;c=3 delta=b²-4.a.c delta=(5)²-4.2.3=1 x=-b+- raiz de delta/2.a x=-5+-1/2.2= x1=-1 x2=-1.5