Q.

If α, β, γ are the roots of the equation x3ax2+bxc=0 then α2(β+γ)=

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a

b2-2acc2

b

a2-2bc2

c

ab-3c

d

ab-3cc

answer is A.

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Detailed Solution

Ifα,β,γarerootsofx3ax2+bxc=0Thenα+β+γ=a,gaβ+βγ+γα=b,αβγ=cα2(β+γ)=α2(β+γ)+β2(γ+α)+γ2(α+β)=α2(aα)+β2(aβ)+γ2(aγ)=a(α2+β2+γ2)(α3+β3+γ3)(1)Nowα2+β2+γ2=(α+β+γ)22(αβ+βγ+γα)a22band  α3aα2+bαc=0β3aβ2+bβc=0γ3aγ3+bγc=0(α3+β3+γ3)a(α2+β2+γ2)+b(α+β+γ)3c=0  ¯

α3+β3+γ3=a(α2+β2+γ2)b(α+β+γ)+3c=a(a22b)b(a)+3c=a32abba+3c=a33ab+3cFrom(1)α2(β+γ)=a(a22b)a3+3ab3c=a32aba3+3ab3c=ab3c

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