Answer :

For the problem as written, we get by F-O-I-L-ing, (9x-4)(3x+9) = 27x2 + 81x - 12x -36 = 27x2 + 69x -36
(9x - 2)(3x + 8)
27x² + 72x - 6x - 16
27x² + 66x - 16

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