The GCF of 2x and 12 is 2.
(2x+3)(2x+4)
6x2=12 2x-28=?
2x2 + 11x + 12 = 2x2 + 3x + 8x + 12 = x*(2x + 3) + 4*(2x + 3) = (2x + 3)*(x + 4)
You can factor it, if you consider that simpler.
(2x - 3)(x - 12)
(5x - 4)(2x + 3)
2x2 - 5x + 12 does not factor. 2x2 - 5x - 12 factors into (2x + 3)(x - 4) 2x2 + 5x - 12 factors into (2x - 3)(x + 4)
x2+2x-120 = (x+12)(x-10) when factored
12x^2+24x+12 12(x^2+2x+1) 12(x+1)^2
(x - 4)(2x + 3)
2(x^2 + 2)(x + 3)