Q.

 Let α,β,γ are real roots of the equation x3+ax2+bx+c=0(a,b,c Randa 0). If  the system of equation (in u,v and w) given by αu+βv+γw=0βu+γv+αw=0γu+αv+βw=0  Has non-trivial solutions, then the value of a2/b is ________

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answer is 3.

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Detailed Solution

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 Equation x3+ax2+bx+c=0 has roots α,β,γ. Therefore, 
α+β+γ=aαβ+βγ+γα=b
Since the given system of equations has non-trivial solutions, we have
α    β    γβ    γ    αγ    α    β=0
Or α3+β3+γ33αβγ=0
Or(α+β+γ)(α+β+γ)23(αβ+βγ+γα)=0
aa23b=0 or a2/b=3

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