I would do this. Multiply through by -1
-1 ( -X^2 +12X +28 )
= X^2 -12X -28
(X+2)(X-14)
(X + 2)(X + 4) Factored
factor the trinomial 16x^2+24x+9
10 + 9x
x2-14x+24=(x-12)(x-2) Since there are no options listed in this question ;), the answer could be either "x-12" or "x-2". How to factor a trinomial: see link.
x2-5x+4 = (x-1)(x-4) when factord
-((x + 2)(x - 9))
(3X + 9) (X + 9)
(x + 12)(x + 7)
(x + 10)(x + 4)
x - 4 APEX
(5x - 4)(3x + 5)
(x+6)(X+20)
(X + 2)(X + 4) Factored
(x + 1)(x + 5)
(x-4)(x-1)
(x + 8)(x - 5)
(x + 11) and/or (x - 6)