SOLUTION: x^4-9x^2+20=0

Question 549327: x^4-9x^2+20=0
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
If you changed variables to
it would simplify into
which you would factor to get , so
factors into
It further factors into

The 4 real solutions to that equation are:
, , , and
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