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Verify that 1, -1 and -3 are the zeroes ...

Verify that 1, -1 and -3 are the zeroes of the cubic polynimial `x^(3)+3x^(2)-x-3` and check the relationship between zeroes and the coefficients.

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The correct Answer is:
`-1, -1` and 3 are zeros of the given polynomial .
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