Find the extreme values of the function subject to the given constraint.  

A. Maximum: 9 at    minimum: -9 at   
B. Maximum: 1 at    minimum: -1 at   
C. Maximum: 1 at    minimum: -1 at   
D. Maximum: 8 at    minimum: -8 at   


Answer: A

Mathematics

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A.
B.
C. 0
D. 3x

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A.  ? 0
B.  < 0
C.  ? 0
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