Factor: 3x2+12x3x^2 + 12x3x2+12x.
3x(x+4)3x(x + 4)3x(x+4)
3(x2+4x)3(x^2+4x)3(x2+4x)
x(3x+12)x(3x+12)x(3x+12)
12x(x+1)12x(x+1)12x(x+1)