Yeah that is how I check the possibility for a function to not have an element of the range...but it dose not help me for finding the range...for example I could use that method to check whether or not 1 is in the range by saying and seeing if there is an x value that satisfies that equation...but it doesnt help me to go o well since then the range is this
Here is an example. Let , the domain is of course all numbers. The range are all so that we can solve the equation for in the domain. We begin by writing, but that can only have a solution if (because the exponentinal is positive). Which means if then . Now to solve this equation we require . For those values we can solve the equation.
Try this example. Find the range of .