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2(5x²) + 2(- xy) + 2(y²) - 3(2x²) - 3(xy) - 3(- 3y²)
10x² - 2xy + 2y² - 6x² - 3xy + 9y²
(10x² - 6x²) + (- 2xy - 3xy) + (2y² + 9y²)
4x² + (- 5xy) + 11y²
4x² - 5xy + 11y²
= 4x²-5xy+11y²