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If A = x^(3), B = 4x^(2) + x -1, C = x +...

If `A = x^(3), B = 4x^(2) + x -1, C = x +1`, then find `(A -B) (A-C)`

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The correct Answer is:
`x^(6) - 4x^(5) - 2x^(4) + 4x^(3) + 5x^(2) -1`
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