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The GCF is 9.
2x2 + 17x - 9 = 2x2 + 18x - x - 9 = 2x(x + 9) - 1(x + 9) = (2x - 1)(x + 9)
9(x - 3y)
(2x+3)(x+3)
factor out a 3x 3x(x-3)=3x2-9x