$17-22$ Explain why the function is discontinuous at the given number $a.$ Sketch the graph of the function.

$f(x)=\frac{1}{x+2}$

$a=-2$

$f(x)=\{\begin{array}{ccc}\frac{1}{x+2}& if& x-2\\ 1& if& x=-2\end{array}$

$a=-2$

$f(x)=\{\begin{array}{ccc}1-x^2& if& x<mn>1</mn>\\ \frac{1}{x}& if& x1\end{array}$

Can you do the questions on a piece of paper and a hand drawn graph