Answer:
8x^2+6xy-5y^2+8y_1^2x^2
Explanation:
- 4x² + 6xy - y²
8x² + 3xy + 4y² - 12x² + 3xy - 5y² ← collect like terms
= (8x² - 12x² ) + (3xy + 3xy) + (4y² - 5y²)
= - 4x² + 6xy - y²
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