SOLUTION: factor this expression: x^4 + 4y^4

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Question 200071: factor this expression:
x^4 + 4y^4
Found 2 solutions by nerdybill, Alan3354:
Answer by nerdybill(7384) About Me  (Show Source):
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
nerdybill's answer doesn't work.
That product is x^4 - 4y^4, not plus.