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What must be subtracted from 2x^(4) + ...

What must be subtracted from ` 2x^(4) + 4x^(2) -3x+7 ` to get ` 3x^(3) -x^(2)+2x +1?`

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The correct Answer is:
`3x^(3) -x^(2) +2x +1.`
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