It is: (x-2)(x-7) when factored
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9x squared plus 16 = 0 factored is plus and minus 4/3 i.
If you mean: x squared+9x+14 = 0 then by using the quadratic equation formula x = -2 or x = -7
That factors to 3x(3x - 1)
(9x2 + 7)(9x2 - 7) = 81x4 - 49
(3x + 8)(3x - 8)