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Find the zeroes of the polynomial p(y)=y...

Find the zeroes of the polynomial `p(y)=y^(3)-5y^(2)-2y+24` if it is given that Sum of the two zeros is 7

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The correct Answer is:
`:.` When `alpha-beta=1`,
the values are `alpha=4, beta=3, r= -2`.
When `alpha-beta-=-1`,
The value are `alpha=3, beta=4, r= -2`.
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