Factoring x^3+y^3+z^3: Conditions & Solutions

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SUMMARY

The expression x^3 + y^3 + z^3 is factorable under specific conditions. It can be factored when x = 1, y = 2, z = 3, or when x = y = z ≥ 2. Additionally, the expression is factorable if the greatest common divisor (gcd) of x, y, and z is greater than 1. However, if gcd(x, y, z) = 1 and gcd(x, y) > 1, the factorability conditions differ.

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  • Understanding of polynomial identities, specifically the sum of cubes.
  • Knowledge of Diophantine equations and their properties.
  • Familiarity with the concept of greatest common divisor (gcd).
  • Basic algebraic manipulation skills.
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  • Research the sum of cubes factoring formula and its applications.
  • Explore Diophantine equations and their relevance to polynomial expressions.
  • Study gcd properties and their implications in number theory.
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JNeutron2186
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Hey everyone first time poster here, I need help with some factoring of cubes. I know this might tie closely to Diophantine equations but here goes.

Under what condition is the expression x^3+y^3+z^3 factorable? Where x,y,z are positive whole numbers.
 
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well it seems to factor if x=1, y=2, z=3, and if x=y=z ≥ 2, and more generally if gcd(x,y,z) > 1.
 
My bad for not stating before. Let's assume the gcd(x,y,z) =1 and gcd(x,y)>1
 

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