Glossary Checklist FAQ

Denominators with Higher Index Roots


Rationalizing the denominator when a single square root is present is straightforward; multiply the numerator and denominator by the same square root. But, what happens when a cube root or higher index root is in the denominator? Multiply the radical in the denominator by an expression that will change the exponent in the radicand so that it is the same as the index. Then, you can remove the radical sign. Again, you must also remember to multiply the numerator by the same expression so that you do not change the original expression!