7(x + 3)(x - 3)
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14x2-7x2-16 7x2-16 (this can't be simplified any more)
x2 - 2x - 14 doesn't factor neatly. Applying the quadratic formula, we find two real solutions: 1 plus or minus the square root of 15x = 4.872983346207417x = -2.872983346207417
The GCF is 9. The LCM is 3528.
(x - 7)(x2 + 7x + 49)
(3x - 8)(8x + 5)