Resposta :
-2x² + 10x = 0
x ( -2x + 10) = 0
>>x = 0
OU -2x +10 = 0
-2x = -10 *(-1)
x = 10/2 >> x = 5
x ( -2x + 10) = 0
>>x = 0
OU -2x +10 = 0
-2x = -10 *(-1)
x = 10/2 >> x = 5