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Question Number 190942 by mathlove last updated on 14/Apr/23
(x+y)(x2−xy+y2)=2x3y3x9+y9−8=?
Answered by Frix last updated on 15/Apr/23
x3+y3=2⇒y3=2−x3x3(2−x3)x9+(2−x3)3−8=x3(2−x3)−6x3(2−x3)=−16
Answered by manxsol last updated on 15/Apr/23
x3+y3=2(x3+y3)3=x9+y9+3x3y3(x3+y3)8=x9+y9+6x3y3−6x3y3=x9+y9−8x3y3−6x3y3=−16
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