## Algebra and Trigonometry 10th Edition

The series has no sum because $|r|=\frac{6}{5}\gt1$
$a_1=-\frac{125}{36}$ $r=\frac{a_2}{a_1}=\frac{\frac{25}{6}}{-\frac{125}{36}}=-\frac{6}{5}$ $|r|=\frac{6}{5}\gt1$