​5​​√​243

About 77.94

GhOsty: He/she may have meant:

243^(1/5) = 3

​5 ​​√​ 243 =

​5​​√​ [ 81 * 3 ]  =

5 ​​*√ 81 * ​​√ 3  =

5 * 9  * ​​√ 3  =

45 ​​√ 3