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Basic maths on your tips
If a²+b²+c²-ab-bc-ca=0 prove that a=b=c #class9 #polynomial
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Janusz
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![If A= [[1,0,-2],[3,-1,0],[-2,1,1]], B= [[0,5,-4],[-2,1,3],[-1,0,2]] and C= [[1,5,2],[-1,1,0],[0,-1,1](http://i.ytimg.com/vi/xMLFMExTMHo/mqdefault.jpg "If A= [[1,0,-2],[3,-1,0],[-2,1,1]], B= [[0,5,-4],[-2,1,3],[-1,0,2]] and C= [[1,5,2],[-1,1,0],[0,-1,1")
![If A= [[1,2,3],[2,0,-2],], B= [[1,1,-1],[2,0,3],[3,-1,2]] and C= [[1,3],[0,2],[-1,4]], find A(BC).](http://i.ytimg.com/vi/bbPuR3re7PI/mqdefault.jpg "If A= [[1,2,3],[2,0,-2],], B= [[1,1,-1],[2,0,3],[3,-1,2]] and C= [[1,3],[0,2],[-1,4]], find A(BC).")
