Resposta :
10(3x - 6 - x^2 +2x) = 0
3x - 6 - x^2 +2x = 0
-x^2 + 5x - 6 =0(-1)
x^2 - 5x + 6 =0
delta= (-5)^2 - 4.1.6= 25-24= 1
x= 5+/-V1 ==>x= 5+/-1
2.1 2
x1= 5+1 ==> x1= 3
2
x2= 5 -1 ==>x2 = 2
2
Letra C
3x - 6 - x^2 +2x = 0
-x^2 + 5x - 6 =0(-1)
x^2 - 5x + 6 =0
delta= (-5)^2 - 4.1.6= 25-24= 1
x= 5+/-V1 ==>x= 5+/-1
2.1 2
x1= 5+1 ==> x1= 3
2
x2= 5 -1 ==>x2 = 2
2
Letra C