SOLUTION: x^4-64

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Question 161207: x^4-64
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!

x%5E4-64=0
%28x%5E2-8%29%28x%5E2%2B8%29=0--->system%28x%5E2=8%2Cx%5E2=-8%29
x=sqrt%288%29 ---> Good!
x=sqrt%28-8%29, don't use
Go back to check:
%28sqrt%288%29%29%5E4-64=0 ---> %288%5E%281%2F2%29%29%5E4-64=0
%288%5E%281%2Fcross%282%29%29%29%5Ecross%284%292-64=0
8%5E2-64=0
64-64=0
0=0
Thank you,
Jojo