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Verified answer
1. ( 2x + 3y ) + ( x + 5y + 1 )= 2x + x + 3y + 5y + 1
= 3x + 8y + 1
2. ( 3x - 5y + 6 ) + ( 2y + 5x )
= 3x + 5x - 5y + 2y + 6
= 8x - 3y + 6
3. ( x² + 2xy + 3y² ) + ( 5x - 4y² )
= x² + 2xy + 3y² - 4y² + 5x
= x² + 5x - y² + 2xy
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