SOLUTION: The problem is: factor completely; (x^4)-5(x^2)(y^2)+(4y^4) Any help is greatly appreciated!

Question 834668: The problem is: factor completely; (x^4)-5(x^2)(y^2)+(4y^4)
Any help is greatly appreciated!
Found 2 solutions by Fombitz, LinnW:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Use a substitution,

Answer by LinnW(1048) (Show Source): You can put this solution on YOUR website!

Let a = x^2
b = y^2
and the equation becomes

or

now factor

substituting back

Now we need to factor further

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