### Examples

- The 4th roots of 81 are 3 and –3, since 3
^{4}= 81 and (–3)^{4}= 81. - The square roots of 81 are 9 and –9, since 9\(^{2}\) = 81 and (–9)\(^{2}\) = 81.

- The 4th roots of 81 are 3 and –3, since 3
^{4}= 81 and (–3)^{4}= 81. - The square roots of 81 are 9 and –9, since 9\(^{2}\) = 81 and (–9)\(^{2}\) = 81.