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Obtain all zeros of a polynomial f(x) = ...

Obtain all zeros of a polynomial `f(x) = 3 x^(4) + 6 x^(3) - 2x^(2) - 10 x - 5` , if two of its zeros are `sqrt((5)/(3)) and - sqrt((5)/(3))`

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The correct Answer is:
`:.` zeros are - `sqrt((5)/(3)),sqrt((5)/(3)), - 1,- 1`
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