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= 3x.3x - 4y.3x + 4y.3x - 4y.4y
= 9x² - 12xy + 12xy - 16y²
= 9x² - 16y²
(3x - 8)(3x + 8)
= 3x.3x - 3x.8 + 3x.8 - 8.8
= 9x² - 24x + 24x - 64
= 9x² - 64