SOLUTION: Factor completely: y^4-1 I am not sure how to factor this. Thank you.

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Question 371369: Factor completely: y^4-1 I am not sure how to factor this. Thank you.
Found 2 solutions by Fombitz, ewatrrr:
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
It's a difference of two squares.

The first factor is also a difference of two squares.


Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!

Hi,
Factoring completely
y^4-1
(y^2 -1)(y^2 +1)
(y-1)(y+1)(y^2+ 1)
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