27^2 = 729
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The cube root of 729 is 9.
The cube root of 729 to the 3rd power is 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