Remember when rationalizing a denominator involving a square root, multiply the numerator and denominator by whatever is under the radical in the denominator.

If the problem is 2/sqrt(3), multiply the numerator and denominator by sqrt(3)/sqrt(3) to get

2sqrt(3)/3.

If the problem involves a cube root, multiply the numerator and denominator by whatever will give you a perfect cube in the denominator.

For example, if the denominator is cube root(3), multiply numerator and denominator by cube root(9). This will make the denominator cube root(27), which equals 3.

Same idea for 4th root, 5th root and so on.