SOLUTION: How do you factor x^4-21x^2-100?

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Question 709932: How do you factor x^4-21x^2-100?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
factor x^4 - 21x^2 - 100
(x^2 - 25)(x^2 + 4)
:
(x^2 - 25) is the difference of squares can be factored
(x - 5)(x + 5)
:
We have (x^2 + 4)(x - 5)(x + 5)