The GCF is 7.
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If you mean: 7x+91 then it can be factored to 7(x+13)
14 is the highest common factor 6 x 14 =8;, 7x 14 = 98 ; 12 x 14 = 168
The factorisation is as follows: 2x2 + 7x - 9 = (x - 1)(2x + 9).
If you mean: 2x2+7x+5 then it is (2x+5)(x+1) when factored
(x - 7)(x2 + 7x + 49)