- 12x² + 60xy - 75y² = - 3(4x² - 20xy + 25y²) = - 3(2x - 5y)² =
= - 3(2x - 5y)(2x - 5y)
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- 12x² + 60xy - 75y² = - 3(4x² - 20xy + 25y²) = - 3(2x - 5y)² =
= - 3(2x - 5y)(2x - 5y)