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What should be added to 2x^(3) +6x^(2)...

What should be added to ` 2x^(3) +6x^(2) -5x +8 ` to get ` 3x^(3) -2x^(2) +6x +15? `

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The correct Answer is:
` x^(3) -8x^(2) +11x+ 7` must be added to get ` 3x^(3) -2x^(2) +6x + 15`
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