4x2 + 14x + 12
= 2(2x2 + 7x + 6)
= 2(2x + 3)(x + 2)
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If you mean: x^2 +14x +24 then it is (x+2)(x+12) when factored
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.
12 to second power is basically 12 times 12, the answer would be 144.
I assume the question is to factor this problem? 6x2 + 14x - 12 can be factored to give (6x - 4)(x + 3) and then factor out a 2 to give 2(3x - 2)(x + 3) OR you could've factored with (3x - 2)(2x + 6), but the final answer would still be the same. 2(3x - 2)(x + 3)
-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.