Consider the function f given below.

$f(x)=\frac{x^2-121}{x-11}$

a$)$ For what x $-$values$($s$)$ is this function not differentiable?

b$)$ Find $f^{\text{'}}(-2).$

a$)f(x)$ is not differentiable at $x=($Use a comma to separate answers as needed.$)$

b$)f^{\text{'}}(-2)=$

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