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) About Me  (Show Source):
You can put this solution on YOUR website!
It's a difference of two squares.
y%5E4-1=%28y%5E2-1%29%28y%5E2%2B1%29
The first factor is also a difference of two squares.
highlight%28y%5E4-1=%28y-1%29%28y%2B1%29%28y%5E2%2B1%29%29

Answer by ewatrrr(24785) About Me  (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)