Respostas

2013-11-21T21:16:16-02:00
Formula: D= delta
D=b²-4.a.c
x=-b±√D/2.a →x1=
→x2=
x=-5±√9/2.1 = -5±3/2 →-5+3/2=-2/2=-1
→-5-3/2=-8/2=-4
x1=-1 x2=-4
fim...
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