Use the Ratio Test to Find the Radius of Convergence $\sum_{n=0}^{\infty} \frac{n(x+2)^{n}}{2^{n+1}}$

Use the ratio test to find the radius of convergence of $\sum_{n=0}^{\infty} \frac{n(x+2)^{n}}{2^{n+1}}$ .