if a+2b+3c=0 prove a3 +8b3+27c3=18abc
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formula :- ( a^3 plus b^3 plus c^3 ) - 3abc -- ( a plus b plus c) ( a^2 plus b^2 plus c^2 - ab -bc-ca) then, according to formula ;- a- a, b- 2b ,&c - 3c so, a^3 plus 8b^3 plus 27c^3 - 3x ax 2bx3c - 18abc
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