Divide and simplify:

$\displaystyle \frac{{{x}^{{2}}-{8}{x}-{20}}}{{{x}^{{2}}+{6}{x}+{8}}}\div\frac{{{x}^{{2}}-{100}}}{{{x}^{{2}}-{16}}}$

Enter the numerator and denominator separately in the boxes below. If the denominator is 1, enter the number 1. Do not leave either box blank. Answer: