Question

Find the first, fourth, and eighth terms of the sequence. A(n) = −3 ∙ 2^x − 1

Answer 1

$\bf A(n)=-3\cdot 2^{n-1}\\\\ -------------------------------\\\\ \textit{first one}\qquad A(1)=-3\cdot 2^{1-1} \\\\\\ \textit{fourth one}\qquad A(4)=-3\cdot 2^{4-1} \\\\\\ \textit{eighth one}\qquad A(8)=-3\cdot 2^{8-1}$