if x^3+4y^3 + 7z^3 is congruent to 0 mod 9 and gcd(x,y,z)=1, why does it mean that x=y=z=o?

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- Apr 21st 2012, 03:02 PMalexandrabel90congruence modulo
if x^3+4y^3 + 7z^3 is congruent to 0 mod 9 and gcd(x,y,z)=1, why does it mean that x=y=z=o?

- Apr 21st 2012, 05:50 PMPetekRe: congruence modulo
- Apr 30th 2012, 03:24 PMalexandrabel90Re: congruence modulo
i found that x^3, y^3 and z^3 have to be congruent to 0 mod 9...hence i can conclude that they are all zero?

- Apr 30th 2012, 05:02 PMPetekRe: congruence modulo
- May 20th 2012, 06:06 AMSMADRe: congruence modulo