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Subtract the sum of 12xy –10y2 –18x2 and 9xy + 12y2 + 14x2 from the sum of
xy + 2y2 and 3y2 – x2.

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Answer: -20xy + 3y² + 3x²

Step-by-step explanation:

(xy + 2y² + 3y² - x²) - (12xy - 10y² - 18x² + 9xy + 12y² + 14x²)

(xy + 5y² - x²) - (21xy + 2y² - 4x²)

xy + 5y² - x² - 21xy - 2y² + 4x²

-20xy + 3y² + 3x²

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