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Let alpha+ibeta,alpha, beta epsilon R, b...

Let `alpha+ibeta,alpha, beta epsilon R`, be a root of the equation `x^(3)+qx+r=0p,q,r epsilonR`. Find a real cubic equation, independent of `alpha` and `beta`, whose one root `2 alpha`.

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The correct Answer is:
`x^3+qx-r=0`
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