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Question

If A(5,2),B(2,4) and point C lies on the locus y=1+x+x2, find the equation of the locus of centroid of ABC.

A
9x239x3y+41=0
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B
9x239x+3y+40=0
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C
9x239x+5y+41=0
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D
9x239x+8y+41=0
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Solution

The correct option is B 9x239x3y+41=0
A(5,-2)
B(2,4)
Let coordinates of C be (α,1+α+α2)
Centrioid(h,k)
(α,1+α+α2)h=5+2+α3α=3h7α=1+4+1+α+α233k=3+(3h7)+(3h7)23k=3+3h7+9h242h+499h239h3k+45=09x239x3y+45=0

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