This question is very similar to Example #2 in this section (§2.3). Note: You can answer this question by direct substitution. However, you are encouraged to work it out in the same way as in the Example to confirm that you understand the concept.

Evaluate the limit
limx5(8x24)(4x8)=\displaystyle \lim_{{{x}\rightarrow{5}}}{\left({8}{x}^{{2}}-{4}\right)}{\left({4}{x}-{8}\right)}=