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What must be subtracted from x3 -6x2 -15x +80 so that the result is exactly divisible by x2 +x -12?

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Let p(x) = x3 -6x2 -15x +80 and q(x) = x2 +x -12

Hence, p(x) is divisible by q (x), if r(x) = 4x-4 is subtracted from it.

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