## College Algebra (6th Edition)

$\frac{1}{3}, -\frac{1}{5}, \frac{1}{9}, -\frac{1}{17}$
To find first four terms of the sequence, we will the number from 1 to 4 and put it into equation. example: $a_{1}=\frac{(-1)^{1+1}}{2^{1}+1}$