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= (3x - 4y)(3x - 4y)
= 3x(3x - 4y) - 4y(3x - 4y)
= 9x² - 12xy - 12xy + 16y²
= 9x² - 24xy + 16y²
= (3x - 4y) (3x - 4y)
= (3x × 3x) (3x × -4y) (-4y × 3x) (-4y ×-4y)
= 9x² - 12xy - 12xy + 16y²
= 9x² + 16y² - 24xy