(x+a)(x+b)(x+c) = x3 +(a+b+c)x2 + (ab+bc+ca)x+abc
let value of x =4 a=1 b=2 c=3
(x+a)(x+b)(x+c) = (4+1)(4+2)(4+3) = 210
x3 +(a+b+c)x2 +(ab+bc+ca)x+abc = 43 +(1+2+3)42 +(1.2+2.3+3.1)4+1.2.3
=64 +96+44+6
= 210
Hence LHS=RHS prooved
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