Respuesta :

kritter1
Assuming x is really x^3; 

∛729 = 9 

The differences of cube rule states: x³-y³= (x-y)(x²+xy+y²) 

(x)³-(9)³=(x-9)(x²+9x+9²)
=(x-9)(x²+9x+81) 

Hope I helped :) 

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