SOLUTION: Factor completely. Show work y^4 - 8y^2 – 9 i am lost

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Question 300764: Factor completely. Show work
y^4 - 8y^2 – 9
i am lost

Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
Make a substitution.
Let , then


Now substitute back,

Both can be factored as a difference of two squares,
where

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