What should be subtracted from the polynomial x power 4 2 x Cube X square 18 x minus 15 so that the resulting polynomial is exactly divisible by X Square 1 x?

What must be subtracted from or added to 6 x4+7 x3 26 x2 25 x+25 so that it may be exactly divisible by 3 x2 x+4 ?

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What must be subtracted from polynomial fx=x4+2x3 13x2 12x+21 so that the resulting polynomial is exactly divisible by x2 4x+3 ?

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