If a2x+2 = 1, where is a positive real number other than 1, then x is equal to?

Answer: Option B

$$\begin{array}{rl}& \Rightarrow a^{2x+2}=1\\ & \Rightarrow a^{2x+2}=a^0\\ & \Rightarrow 2x+2=0\\ & \Rightarrow x=-\frac{2}{2}\\ & \Rightarrow x=-1\end{array}$$