The factorisation is as follows:
2x2 + 7x - 9 = (x - 1)(2x + 9).
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6ab(2x2+x-5)
The GCF is 7x^7.
If that's - 338, the answer is 2(x + 13)(x - 13)
That doesn't factor neatly. Applying the quadratic formula, we find two real solutions: 10 plus or minus 4 times the square root of 7. x = 20.583005244258363 x = -0.5830052442583629
If that's +28, the answer is (x - 4)