How do you factor #x^6 - x^4 - 2x^2 + 2#?
Factor by grouping, then using difference of squares three times to find:
In the following, we first factor by grouping then use the difference of squares identity:
up to three times...
If we allow irrational coefficients we can break this down some more using difference of squares a couple more times...
There are no simpler linear factors with real coefficients since: