1. The problem is to find the value of the function $g(x)$ at $x=3$, i.e., find $g(3)$. 2. To solve this, you need the definition or formula of the function $g(x)$. Without the formula, you cannot evaluate $g(3)$. 3. Suppose the function is given by $g(x) = 2x - 4$ (as an example). Then, to find $g(3)$, substitute $x=3$ into the formula: $$g(3) = 2(3) - 4$$ 4. Calculate the right side: $$g(3) = 6 - 4 = 2$$ 5. Therefore, the value of $g(3)$ is 2. 6. If you got 2 as the answer, it means you correctly substituted $x=3$ into the function and simplified properly. 7. Always remember to replace the variable with the given number and then perform arithmetic operations step-by-step to avoid mistakes.