-qbkr21
Follow Math Help Forum on Facebook and Google+
You use the ratio test improperly, $\displaystyle \left| \frac{(-1)^{n+1}(x+3)^{n+1}}{(n+1)5^{n+1}} \cdot \frac{n5^n}{(-1)^n(x+3)^n} \right| \to \frac{|x+3|}{5}$ We need that, $\displaystyle \frac{|x+3|}{5} < 1$ Solve from there thyself.
View Tag Cloud