Consider the Rational Function Defined By $f(x)=\frac{x^{2}-9}{x-3}$
(A) for What Value Of f(x)=\frac{x^{2}-9}{x-3}

Essay

Consider the rational function defined by $f(x)=\frac{x^{2}-9}{x-3}$ .
(a) For what value of $x$ does the graph exhibit a "hole"?
(b) Graph the function and show the "hole" in the graph.