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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 !

 

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

 

 

laugh  !

 Sep 18, 2017
edited by asinus  Sep 18, 2017

Best Answer 

 #1
avatar+100809 
+1

  z^4=81

 

z=3    is one answer, the others are    z=-3,    z=3i    and     z=-3i

 Sep 18, 2017
 #1
avatar+100809 
+1
Best Answer

  z^4=81

 

z=3    is one answer, the others are    z=-3,    z=3i    and     z=-3i

Melody Sep 18, 2017

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