Sec$8\mathrm{.}2$: Problem $15$

$(1$ point$)$

Book Problem $27$

a$)$ Find the values of $x$ for which the series ${\displaystyle \underset{n=1}{\overset{}{}}}\frac{x^n}{5^n}$ converges.

Answer:

$x=,x$

$(b)$ Find the sum $of$ the series for those values $ofx.$

Sum $=,(your$ answer should $be$ a function $ofx)$