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my question: what is the cube root of 729?, please answer if you can, regards

Cube root of 729 is 9. To calculate such things yourself, just go to alphawolfram and type the question as such. The site is able to guess the right math formula to apply.

...Cube root of 729 is the number k such that k*k*k = 729 (i.e k^3 = 729)

To get k, we can use factorization method: