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Question

Factorise:
a2(b+c)+b2(c+a)+c2(a+b)+2abc

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Solution

a(b2+c2)+b(c2+a2)+c(a2+b2)+2abc
=ab2+ac2+bc2+ba2+ca2+cb2+2abc
=ba2+ca2+ab2+ac2+2abc+bc2+cb2
=a2(b+c)+a(b2+c2+2bc)+bc(c+b)
=a2(b+c)+(b+c)2+bc(b+c)
=(b+c)[(a2+a(b+c)+bc]
=(b+c)[a2+ab+ac+bc]
=(b+c)[a(a+b)+c(a+b)]
=(b+c)(a+b)(a+c)
=(a+b)(b+c)(c+a)

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