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

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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 !

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

!

Sep 18, 2017
edited by asinus  Sep 18, 2017

#1
+100809
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z^4=81

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

Sep 18, 2017

#1
+100809
+1