=x[x^(3n+3)+ 1]
The second question is relatively simple, put one? ，-b？ On the whole, you will find that it is actually a cubic formula: (x+y)=x? +3x？ y+3xy？ +y？ , the rest is very simple.
a^6-3a^4b^2+3a^2b^4-b^6
=(a？ -B? )?
=(a+b)？ (a-b)?