9x2...I guess that means 9x squared ?
The problem: 9x(squared)+12x+4
Here's the answer: (3x+2)(3x+2) or even more simplified: (3x+2) squared
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4x2+12x = 4x(x+3) when factored
x2+12x+28Improved Answer:--x2+12x+28 = (-x+14)(x+2) when factored
If you mean: x^2 +12x +20 then it is (x+2)(x+10) when factored
(x + 7)(x + 5)
2(x - 3)(x - 3)