Here we have the expressions a(a-b),b(b-c) and c(c-a)
Using the distributive law a(a-b) = a2-ab,b(b-c) = b2-bc and c(c-a) = c2-ca
Now we add the terms (a2-ab) + (b2-bc) + (c2-ca)
= a2 + b2 + c2-ab-bc-ca
Hence addition of the product of the above expressions is a2 + b2 + c2-ab-bc-ca.
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