anyone knows how to do this ...thing .... z 4 =81

anyone knows how to do this ...thing ....     z⁴=81

Hello Guest!

 z⁴ = z * z * z * z

81 = 3 * 3 * 3 * 3

z * z * z * z = 3 * 3 * 3 * 3

               z = 3   logical !

$\color{BrickRed}z^4=81\\ z= \sqrt[4]{81}=\sqrt{\sqrt{81}}=\sqrt{9 }\color{blue}=3$

  !