3x² + 4y², 2y² + 2xy - x², x² + 2y²
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3x² + 4y² ; 2y² + 2xy - x² ; x² + 2y²
( 3x² + 4y²) + ( 2y² + 2xy -x²) + ( x² + 2y²)
3x² - x² + x² + 4y² + 2y² + 2y² + 2xy ....( taking like terms)
Therefore , 3x² + 8y² + 2xy
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