Calculating power of a hypothesis test for proportions

[bryandnk]

Homework Statement

[PLAIN]http://img19.imageshack.us/img19/7396/66899700.jpg

The Attempt at a Solution

Please help, Would the power test be something like:

beta = P(Z < Z_alpha_2 - delta/(1/m+1/n)^.5)

power = 1 - beta

 

[bryandnk]

so does anyone know if I did this right?