# How do you write the first five terms of the geometric sequence with the first term a1 and common ratio r a1=5 , r = -1/2?

erms would be $5 , - \frac{5}{2} , \frac{5}{4} , - \frac{5}{8} , \frac{5}{16}$
If first term is a and common ratio is r, the series would be $a , a r , a {r}^{2} , a {r}^{3} \ldots .$
terms would be $5 , - \frac{5}{2} , \frac{5}{4} , - \frac{5}{8} , \frac{5}{16}$