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2(5x²-xy+y²)-3(2x²+xy-3y²) = 10x² - 2xy + 2y² - 6x² - 3xy + 9y²
= 4x² - 5xy + 11y² = 4x² + 11y² - 5xy
No. 2
3x²-5x+7-2x²+4x-9 = x² - x -2 = (x-2) (x+1)
^_^