I have a section in my book that is asking me to "make an appropriate substitution" for a set of problems; and the book doesn't even give examples on how to do this sort of thing.

Here is one for example:

x^4-5x^2+4=0

Help, anyone?

Thanks

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- Dec 7th 2011, 09:15 AMannon25Quadratic Equations and Substituting "Appropriately?"
I have a section in my book that is asking me to "make an appropriate substitution" for a set of problems; and the book doesn't even give examples on how to do this sort of thing.

Here is one for example:

x^4-5x^2+4=0

Help, anyone?

Thanks - Dec 7th 2011, 09:21 AMQuackyRe: Quadratic Equations and Substituting "Appropriately?"
Let $\displaystyle x^2=k$

- Dec 7th 2011, 09:30 AMTheChazRe: Quadratic Equations and Substituting "Appropriately?"