CPM Homework Help : PC Problem 5-79

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5-79.

Use a graph or a table to compute the following limits.

$\lim\limits _ { x \rightarrow 3 } ( x ^ { 2 } - 9 )$
Graph (a):

$\lim\limits_ { x \rightarrow 3 ^ { + } } \frac { 1 } { x ^ { 2 } - 9 }$
Graph (b):

$\lim\limits_ { x \rightarrow 3 ^ { - } } \frac { 1 } { x ^ { 2 } - 9 }$

$\lim\limits_ { x \rightarrow 3 } \frac { 1 } { x ^ { 2 } - 9 }$
Hint (d):
Are the left and the right limits the same?

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