SOLUTION: how to Factor a Polynomial Completely b^4-9b^2

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Question 645579: how to Factor a Polynomial Completely
b^4-9b^2
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Factor Polynomial Completely

b%5E4-9b%5E2+=+b%5E2%28b%5E2-9%29+=+b%5E2%28b%2B3%29%28b-3%29+

checking (b+3)(b-3) using FOIL

F	First terms  b^2

O	Outside terms -3b

I	Inside terms   3b

L	Last terms    -9