Resposta:
3x² + 2x + 1 = 0
a= 3 b= 2 c= 1 Completa
x² + 7x + 3 = 0
a= 1 b= 7 c= 3 Completa
x² + x = 0
a= 1 b= 1 c= 0 Incompleta
2x² + 12 = 0
a= 2 b= 0 c= 12 Incompleta
x² + 4x + 7 = 0
a= 1 b= 4 c= 7 Completa
5x² = 0
a= 5 b= 0 c= 0 Incompleta
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