(4x² - 5xy + 2y²) - (-x² + 2xy - y²)
Remove the parentheses:
4x² - 5xy + 2y² + x² - 2xy + y²
Add like terms:
(4x² + x²) + (-5xy - 2xy) + (2y² + y²)
5x² - 7xy + 3y²
