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b) (2-1) x^2 + (-5+7) xy + (2-3) y^2 = x^2 + 2xy - y^2
= 6a - 4a - 2ab + 2ab + 7b - 3b
= 2a + 4b
2x² - 5xy + 2y² + (- x² + 7xy - 3y²) = 2x² - 5xy + 2y² - x² + 7xy - 3y²
= 2x² - x² - 5xy + 7xy + 2y² - 3y²
= x² + 2xy - y²