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16x2 + 8x + 1 - 9y2 = (4x + 1)2 - (3y)2 which is a difference of two squares. = (4x + 1 + 3y)*(4x + 1 - 3y)
(4x + 5)(3x - 7)
n = 8
(4x - 7)(4x + 7)