Find the Interval of Convergence For $\sum _ { n = 1 } ^ { \infty } \frac { x ^ { n } } { 4 n ^ { 2 } }$

Essay

Find the interval of convergence for $\sum _ { n = 1 } ^ { \infty } \frac { x ^ { n } } { 4 n ^ { 2 } }$ .