~2.519
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cuberoot(8) + cuberoot(8) + cuberoot(8) = 6
9000
The answer depends on the functions that you may use. A possible solution: cuberoot(8) + cuberoot(8) + cuberoot(8) = 2 + 2 + 2 = 6
Suppose sqrt(16) = x and cuberoot(16) = y, then then x^2 = 16 = y^3 so that x^(2/3) = y x = y^(3/2).
It is a root of a number where that root cannot be made into a rational number. For example, the cuberoot(27/64) is 3/4 and so is not a radical but cuberoot(32/64) = cuberoot(1/2) = 3√(1/2) cannot be simplified or rationalised further.