add 2x³-9x²+8,3x²-6x-5,7x³-10x+1,3+2x-4x³-5x²
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Step-by-step explanation:
( 3x³ - 2x² - x + 4 ) + ( 2x³ + 7x² - 3x - 3 )
= 3x³ - 2x² - x + 4 + 2x³ + 7x² - 3x - 3
= 3x³ + 2x³ - 2x² + 7x² - x - 3x + 4 - 3
= 5x³ + 5x² - 4x + 1
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