Functions #3

Today, I learned that a function was an equation that you could put a in number called an input to end up with a solution which is the output. An example of a basic function equation would be f(x)=2x^2+1. A subsection of a function would be its domain. A domain is what you ask yourself, "what can I put in?" There are two ways to solve domains. First, if the problem has a square root you must set it to > or equal to 0, because a negative cannot be in a square root. Second, if there is denominator in the problem, set each denominator to zero, but keep in mind, the answer cannot be zero. If the answer is zero, the solution is undefined.