


ExponentsThe Cube RootThe cube root is the reverse operation of cubing a number. Example2^{3 }= 8, so 2 is a cube root of 8. (2)^{3} = 8, so 2 is a cube root of 8.
As you can see, all numbers have a unique cube root. The cube root of a positive number b is denoted by or (See nth root for more on fractional notation) and the cube root of a negative number b is .
The graph of x^{3} is shown below. From the graph we can clearly see that each positive number will have a positive cube root, and each negative number will have a negative cube root.
Now try a few on your own. ExerciseIf the cube root of b is an integer, display it in the box provided; otherwise type NI for "not integer". << Square Root  Exponents Index  n^{th} Root >>
