Given a sequence formula find the first four terms with alternating signs

The video tutorial explains how to determine the first four terms of a sequence using a formula. It emphasizes the importance of showing work to avoid mistakes and highlights the pattern of alternating signs in the sequence. Each term is calculated step-by-step, demonstrating the process and the resulting values.

What is the final result of evaluating the fourth term?

Explain the pattern observed in the signs of the terms as you evaluate them.