multiply polynomials
(2n+2)(6n+1)
\((2n+2)(6n+1)=2n\cdot 6n +2n\cdot 1+2\cdot 6n +2\cdot 1=\\ \\=12n^2+2n+12n+2=12n^2+14n +2\)
\((2n+2)(6n+1)\\12n^2+2n+12n+2\\12n^2+14n+2\)
