Enter radical expression

Simplify √81.

If you use a guess and check method, you see that 8² = 64 and 10² = 100.
Since 64 < 81 < 100 the next logical step would be checking 9².

9² = 9 x 9
9² = 81 <--- We match our original number!!!
Therefore, √81 = ±9

Therefore, we can factor out 9 from the radical, and leave under the radical

We can factor out the following portion using the highest even powers of variables: