Find the sixth term of the sequence a(n)=6+(n-)

Supposing that the first term is obtained for =6+0\times(-2)=6" alt="u_6=6+(6-1)(-2)=6+5\times(-2)\\=6-10\\=-4\\\text{We deduce the sixth term o the sequence is the following:} -4" />=6+0\times(-2)=6" />
then we obtain the sixth term by setting n = 6 in the formula like this: