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In the coordinate plane, A=(4,-1), B=(6,2), C=(-1,2)  There exists a point Q and a constant k such that for any point P, PA^2 + PB^2 + PC^2 = 3PQ^2 + k.
Find the constant k.

 Aug 6, 2020
 #1
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Nevermind, I found the answer myself! 

 Aug 6, 2020

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