Answers

2015-06-29T12:19:38+05:30
Answer is 1
Using identity x3 + y3 + z3 - 3xyz = (x + y + z)(x2 + y2 + z2 - xy - yz - zx) =  (3x + y + z)(9x2 + y2 + z2 - 3xy - yz - 3zx) 
and (x+y+z)^2= x^2+y^2+z^2 +2(xy+yz+zx)

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