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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:
The required polynomial is `x^(3)- 8x^(2) + 11x + 7`
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