X=5
If you mean: 3x+12 then it is 3(x+4) when factorized
3x2 - 8x = x(3x - 8)
3x+12=(3(x+4))
the answer is x(3+y)
16
It is: 3(x+2)
x2 + 2x - 15 = x2 - 3x + 5x - 15 = x(x - 3) + 5(x - 3) = (x + 5)(x - 3)
6x - 27xy= 3x(2 - 9y)=========
It is: x(x-3) factorized
24-36x =12(2-3x)
6x^3 + 3x = 3x(2x^2 + 1)