Question

Brainliest and Five Stars for correct answers

Answer 1

$\bf \lim\limits_{x\to 9}~\cfrac{x^2-81}{x-9}\implies \cfrac{\stackrel{\textit{difference of squares}}{x^2-9^2}}{x-9}\implies \cfrac{\underline{(x-9)}(x+9)}{\underline{(x-9)}} \\\\\\ \lim\limits_{x\to 9}~x+9\implies (9)+9\implies 18$