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Find All Critical Numbers for the Function $f ( x ) = \frac { 1 } { x ^ { 2 } - 9 }$

Question 188

Multiple Choice

Find all critical numbers for the function $f ( x ) = \frac { 1 } { x ^ { 2 } - 9 }$ .

A) 0
B) -3
C) 0, -3
D) No Critical Number
E) 3
F) 3, -3
G) 0, 3, -3
H) None of the above

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