Which is the equation of 2^x - 1 - 7 = 9 after it is reduced so that both sides of the equation are exponential functions with the same base?


A) 2^x-1 = 4^2


B) 2^x-1 - 7^1= 3^2


C) 2^x-1 - 7= 3^2


D) 2^x-1 = 2^4

its D