find the sum using column method 3x³ - 5x² + 8x + 10, 15x³ - 6x² - 23 and 9x² - 4x + 15
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3x³ - 5x² + 8x + 10
15x³ - 6x² + 0 - 23
(+) 0 + 9x² - 4x + 15
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18x³ - 2x² + 4x - 2
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