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a) 17x² + 3x + 4
b) 12x²y + 3x²y² - 4xy²
c) 10x²y - 3xy² + 8x²y² + 29
Step-by-step explanation:
a) (10x² + 5x - 3)+(7x² - 2x + 7)
=> 10x² + 5x - 3 + 7x² - 2x + 7
=> 17x² + 3x + 4
b) (3x²y + 4x²y² - 7xy²) + (9x²y - x²y² + 3xy²)
=> 3x²y + 4x²y² - 7xy² + 9x²y - x²y² + 3xy²
=> 12x²y + 3x²y² - 4xy²
c) (10x²y - 3xy² + 5x²y² + 22) + (3x²y² + 7)
=> 10x²y - 3xy² + 5x²y² + 22 + 3x²y² + 7
=> 10x²y - 3xy² + 8x²y² + 29
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