Consider the rational function

$\displaystyle {f{{\left({x}\right)}}}=\frac{{{4}{x}-{20}}}{{{x}^{{2}}+{3}{x}-{40}}}$

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 $\displaystyle {x}=$