Answer:
x² - 2xy - 10y²
Explanation:
(3x² - 5xy - 6y²) - (2x² - 3xy + 4y²)
3x² - 5xy - 6y² - 2x² + 3xy - 4y² (remove parentheses)
3x² - 2x² - 5xy + 3xy - 6y² - 4y² (Arrange to solve more easily)
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