You have two exponential functions. one function has the formula g(x) = 5 ^x . the other function has the formula h(x) = 5^-x . which option below gives formula for k(x) = (g - h)(x)?

We are given with two functions here: h(x) is 5^-x and g(x) is 5^x . we are asked in the problem to determine the value of the expression (g-h)(x). In this case, we just have to employ subtraction to the given functions. That is 

(g-h)(x) = 5^x - 5^-x
             = 5^x -1/5^x
             = (5^2x -1)/5^x