There is no integer solution. Quadratic formula gives x = -17.66 or 5.66
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x2+12x+5 = 3 x2+12x+5-3 = 0 x2+12x+2 = 0
168
x2 + 12x - 64 = 0 ∴ (x + 16)(x - 4) = 0 ∴ x ∈ {4, -16}
It is -13.
x2+12x+28Improved Answer:--x2+12x+28 = (-x+14)(x+2) when factored