The cube root of 729 is 9.
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The cube root of 729 to the 3rd power is 729
27^2 = 729
The "cube root" of 729 is 9.
That's the same as the square root of 729, multiplied by i - where "i" is the so-called "imaginary unit".
729 = 9 x 9 x 9. So the cube root is 9