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Question

Let α,β,γ be the roots of the equation x312x2+44x48=0. If the coordinates of the vertices of a triangle are A(α,1α), B(β,1β) and C(γ,1γ), then the centroid of the ABC is

A
(4,1136)
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B
(1136,4)
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C
(3,511)
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D
(511,3)
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Solution

The correct option is A (4,1136)
Given : x312x2+44x48=0

Centroid =⎜ ⎜ ⎜α+β+γ3,1α+1β+1γ3⎟ ⎟ ⎟

Now, α+β+γ3=123=4

13(1α+1β+1γ)=13(αβ+βγ+γααβγ)=13(4448)=1136

Therefore, centroid =(4,1136)

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