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Question Number 95982 by mpym last updated on 29/May/20

Σx(y^3 −z^3 )=_____.

Σx(y3−z3)=_____.

Answered by mr W last updated on 29/May/20

=x(y^3 −z^3 )+y(z^3 −x^3 )+z(x^3 −y^3 ) =−xy(x−y)(x+y)−yz(y−z)(y+z)−zx(z−x)(z+x)

=x(y3−z3)+y(z3−x3)+z(x3−y3)=−xy(x−y)(x+y)−yz(y−z)(y+z)−zx(z−x)(z+x)

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