Here you have a lot of freedom with the answers, I'll write a couple:
[tex]2(n+1)=\begin{cases}2n+2 \\ 2(1+n) \\ \sqrt[]{(2(n+1))^2} \\ \frac{2(n+1)}{1}\end{cases}[/tex]In the first one the distributive propierty was applied.
In the second one, the conmutative propierty was applied
THe third one is squared and the taken the square root
The last one is simply divided by 1
