SOLUTION: factor completely 25x^4 - 100y^2

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Question 659970: factor completely
25x^4 - 100y^2
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Starting with
25x^4 - 100y^2
(5x^2 - 10y)(5x^2 + 10y) mixed signs due to - 100y^2
25(x^2-2y)(x^2+2y)
Alternatively,
factor out 25 immediately
25(x^4-4y^2)
25(x^2+2y)(x^2-2y)