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Question

Let f:RR be the function f(x)=(xa1)(xa2)+(xa2)(xa3)+(xx3)(xx1) with a1,a2,a3R Then f(x)0 if and only if

A
at least two of a1,a2,a3 are equal
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B
a1=a2=a3
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C
a1,a2,a3 are all distinct
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D
a1,a2,a3 are all positive and3 distinct
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Solution

The correct option is B a1=a2=a3
f(x)=(xa1)(xa2)+(xa2)(xa3)+(xa3)(xa1)
f(x)=3x22(a1+a2+a3)x+(a1a2+a2a3+a3a1)
Given f(x)0
4(a1+a2+a3)212(a1a2+a2a3+a3a1)0
4a21+4a22+4a234a2a34a3a14a1a20
(a1a2)2+(a2a3)2+(a3a1)2
Sum must be equal to zero
(a1a2)2+(a2a3)2+(a3a1)2=0 only if a1=a2=a3

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