Find all points (x, y) where
has a possible relative maximum or minimum. Use the second-derivative test to determine, if possible, the nature of f(x, y) at each of these points.
A. (-2, 1) is a relative minimum
B. (-2, 1) is a relative maximum
C. (2, -1) is a relative minimum
D. (2, -1) is a relative maximum
Answer: C
Mathematics
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