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Answer:
Step-by-step explanation:
6. ( (5x³-7x²-3x-4) - (8x³+2x²+3x-7) )
= ( 5x³ - 7x² - 3x - 4 - 8x³ - 2x² - 3x + 7 )
= ( (5x³ - 8x³) + (-7x² - 2x²) + (-3x - 3x) + (-4 + 7) )
= ( -3x³ - 9x² - 6 )
7. ( (2x²y - 5xy + 3y²) - (7xy - 6y² + 5x²y) )
= ( 2x²y - 5xy + 3y² - 7xy + 6y² - 5x²y )
= ( 2x²y - 5xy - 5x²y - 7xy + 6y² + 3y² )
= ( -3x²y - 12xy + 9y²)
8. ( (9x⁵ - 6x³ + 7x²) - (7x³ - 6x⁵ + 2x²) )
= ( 9x⁵ - 6x³ + 7x² - 7x³ + 6x⁵ - 2x² )
= ( 9x⁵ - 6x³ - 7x³ + 6x⁵ + 7x² - 2x² )
= ( 15x⁵ - 13x³ + 5x² )
9. ( (6x² - 3x + 8) - (4x³ - 5x - 8) )
= ( 6x² - 3x + 8 - 4x³ + 5x + 8 )
= ( 6x² - 3x + 8 - 4x³ + 5x + 8 )
= ( -4x³ + 6x² + 2x + 16 )
10. ( (1.5y³ + 4.8y² + 12) - (y³ - 1.7y² + 2y) )
= ( 1.5y³ + 4.8y² + 12 - y³ + 1.7y² - 2y )
= ( 1.5y³ - y³ + 4.8y² + 1.7y² - 2y + 12 )
= ( 0.5y³ + 6.5y² - 2y + 12 )