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Row Method
4x² - 5xy + 3y²+( - 6x²-4xy + 2y²)
⇒ 4x² - 5xy + 3y² - 6x² -4xy + 2y²
⇒ 4x² - 6x² + 3y² + 2y² - 5xy -4xy
⇒ -2x² + 5y² - 9xy (ans)
Column Method
4x² - 5xy + 3y²
+
- 6x²-4xy + 2y²
____________________
- 2x² - 9xy + 5y²
Answer = - 2x² - 9xy + 5y²
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