1.

Factorize (a+b)^3+(b+c)^3+(c+a)^3-3(a+b)(b+c)(c+a)

Answer»

Step-by-step EXPLANATION:

a^3(B-c)^3+b^3(c-a)^3+c^3(a-b)^3 = [a(b-c)]^3 + [b(c-a)]^3 + [c(a-b)]^3

We KNOW, a^3 + b^3 + c^3 =3ABC if a+b+c =0

Here, a =[a(b-c)] , b = [b(c-a)] & c =[c(a-b)]

⇒a+b+c =  [a(b-c)] + [b(c-a)] + [c(a-b)]

             = ab - ac + BC - ab + ac - bc = 0

Therefore, a^3 + b^3 + c^3 = 3abc

⇒[a(b-c)]^3 + [b(c-a)]^3 + [c(a-b)]^3 = 3 [a(b-c)] [b(c-a)] [c(a-b)]

                                                     = 3abc* (b-c)* (c-a)* (a-b)


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