a2+4b2+c2-4ab-4bc+2ca
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a2+4b2+c2-4ab -4bc+ 2ca
= (a-2b+c)^2
because in minus term i.e,-4ab-4bc there is b point common hence it is minus
= (a-2b+c)^2
because in minus term i.e,-4ab-4bc there is b point common hence it is minus
NeelamG:
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