SOLUTION: I am totally stumped at the end and need some help. 16x^4 - 40x^2 + 9 I have: (4x^2 -1) (4x^2 -9) and now I'm lost. Can someone help me to factor this completely where I can und

Question 103071: I am totally stumped at the end and need some help.
16x^4 - 40x^2 + 9
I have: (4x^2 -1) (4x^2 -9) and now I'm lost. Can someone help me to factor this completely where I can understand. Thank you.
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
You are obviously not "totally" stumped as your first step is definitely good.
Factor:
Notice that these two factors are the difference of squares. The difference of squares can be factored thus:
So, applying this to your result, we get:

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