SOLUTION: I am taking college algebra and I am having a hard time understanding the problem. Here's the problem: Solve the equation by making an appropriate substitution: x^4-9x^2=-20. Help

Question 701956: I am taking college algebra and I am having a hard time understanding the problem. Here's the problem: Solve the equation by making an appropriate substitution: x^4-9x^2=-20. Help me!!!
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

Let

Solve the quadratic for

. Then substitute

back into each of the expressions for the value of

giving you two additional quadratics. Solve each for

over the complex numbers. Note: In accordance with the Fundamental Theorem of Algebra, you will ultimately have four zeros for the 4th degree polynomial equation.

John

Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it

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