Determining Limits Using Algebraic Manipulation Practice Test

As $x$ approaches $3$, what is the value of $\displaystyle \lim_{x\to 3}\frac{x^2-9}{x-3}$ after algebraic simplification?

A sensor’s output is modeled by $f(x)=\frac{x^2-9}{x-3}$; find $\lim_{x\to 3} f(x)$ from its simplified form.