SOLUTION: How do I completely factor {{{81x^4-16}}}?

Question 9656: How do I completely factor ?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
First, you need to recognise this as the difference of two squares, and this factors like:

Again, you have the difference of two squares, so this will factor.

If you really want to factor completely, the the sum of two squares can be factored: where:
The complete factorisation then is:
If you are not yet into complex numbers, then leave it at:

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