Evaluating and Interpreting Function Notation

Using the functions $f(x)$ and $g(x),$ we want to evaluate $f(3)+g(3).$ There are three steps involved in this evaluation.

1. We need to substitute $3$ for $x$ in the equation $f(x).$
2. We need to substitute $3$ for $x$ in the equation $g(x).$
3. We need to add the results.

Let's first take care of the substitution. To do this, we need to substitute $3$ for $x$ in $f(x)$ and $g(x).$ Let's begin with $f(3).$ Now, let's evaluate the value of $g(3).$ Finally, let's add these values to each other. We have found that $f(3)+g(3)=25.$