Which graph represents the function f(x) = log(-2(x +

If a function is one-to-one, that is, if the function has the property that nohorizontal line intersects the graph of the function more than once (horizontal line test), the function must have an inverse function. by looking at the graphs of the exponential functions you can see that every function of the form: passes the horizontal line test and therefore must have an inversefunction. this inverse function is called the logarithmic function with base  . therefore, the graph of the equation:   is shown in the figure below. so this function always decreases on the interval . we can also get the letting like this: finally, this function does not have any