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If z0=alpha+ibeta,i=sqrt(-1) , then roo...

If `z_0=alpha+ibeta,i=sqrt(-1)` , then roots of the equation `x^3-2(1+alpha)x^2+(4alpha+alpha^2+beta^2)x-2(alpha^2+beta^2` )= 0 are `(a)2,z_0,( z ^_)_0` (b) `1,z_o( z^- )_0` `(c)2,z_0,( z )_0` (d) `2,-z_0,-( z )_0`

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