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Question

Verify the following:

(ii) (a+b+c)(a2+b2+c2abbcca)=a3+b3+c33abc

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Solution

L.H.S:

(a+b+c)(a2+b2+c2abbcca)

=a(a2+b2+c2abbcca)+b(a2+b2+c2abbcca)+c(a2+b2+c2abbcca)

=a3+ab2+ac2a2babcca2+a2b+b3+bc2ab2b2cabc+ca2+b2c+c3abcbc2ac2

=a3+b3+c33abc

=R.H.S

Hence, verified.

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