12x-4x^2=0
12x - 22x2 = 0
12x - 4x2 = -4x • (x - 3)
-4x • (x - 3) = 0
-4x = 0
(-1) : 4x = 0
x = 0
x-3 = 0
x = 3
12x-4x^2=0
12x - 22x2 = 0
12x - 4x2 = -4x • (x - 3)
-4x • (x - 3) = 0
-4x = 0
(-1) : 4x = 0
x = 0
x-3 = 0
x = 3