Consider the rational function

$\displaystyle {f{{\left({x}\right)}}}=\frac{{-{4}{x}-{12}}}{{{x}^{{2}}+{12}{x}+{27}}}$

Factor the numerator to get Preview Question 6 Part 1 of 3  

Factor the denominator to get Preview Question 6 Part 2 of 3  

The rational function $\displaystyle {f}$ has a hole at $\displaystyle {x}=$