SOLUTION: I need help with this problem. solve x^4+10x^2+9=0 Thank you!

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Question 481460: I need help with this problem.
solve x^4+10x^2+9=0
Thank you!

Answer by Earlsdon(6294)   (Show Source): You can put this solution on YOUR website!
You can use a temporary substitution in which , so...
Substitute
Factor.
Apply the "zero product" rule.
or so that...
or Now replace the temporary variable z with to get:
or and so...
, , or , But these can be simplified to...
, or , where

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