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

question 155

Multiple Choice

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

• 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