488. (5a² + 2a-12) (9a² +8a - 4) 489. (10x²-3x+5) - (4x² - 6) 490. (-3) ³

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A: Please see the below picture for detailed solution.

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A: Use long division method ,step by step

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A: SOLUTION-

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A: Given query is to find why 3 is not in the solution.

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