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

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Question 549318: Solve. x^4-9x^2+20=0
Answer by solver91311(24713)   (Show Source): You can put this solution on YOUR website!




Let

Then



Factor



So:



or



But since :



or



Hence



or



Giving us the four roots we expect from a quartic equation.

John

My calculator said it, I believe it, that settles it
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