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Verify that 3,\ 1,-1/3are the zeroes of ...

Verify that `3,\ 1,-1/3`are the zeroes of the cubic polynomial `p(x)=3x^3-5x^2-11 x-3`, and then verify the relationship between the zeroes and the coefficients.

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The zeroes of a polynomial are the values of `x` that satisfies the equation and makes the polynomial equal to zero as a whole.
Let us put the values of `x` in the polynomial to verify the zeroes of the polynomial.
Given, `p(x) = 3x^3 - 5x^2 - 11x - 3`
...
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