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9x2-1 = (3x+1)(3x-1)
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Step 1: Divide by 9x: 9x (x2 + 3x - 10) = 9x(x + 5)(x - 2)
9x2 + 8x - 1 = (9x - 1)(x + 1)
(9x + 8)(9x - 8)
x^2-9x+18=(x-6)(x-3)
x2 - 9x + 8 = (x-1)(x-8)