Me ajudem Por favor  (gama Filho-RJ) As raizes de x² +  ax + a = 0  sao reais e destintas se  e somente se
A) a < 0 ou a >4 
B) a < -4 ou a > 0 
C) a <-4 ou a > 4 
D) -4 <a < 4 
E) 0<a<4  
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