4x² - 12xy + 9y² - 4a² - 4ab - b² = (4x² - 12xy + 9y²) - (4a² + 4ab + b²) =
= (2x - 3y)² - (2a + b)² = (2x- 3y - 2a - b)(2x - 3y + 2a + b)
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Verified answer
4x² - 12xy + 9y² - 4a² - 4ab - b² = (4x² - 12xy + 9y²) - (4a² + 4ab + b²) =
= (2x - 3y)² - (2a + b)² = (2x- 3y - 2a - b)(2x - 3y + 2a + b)