Suppose a function z = (x, y) satisfies the criteria for the test for relative extrema at
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Suppose a function z = ƒ(x, y) satisfies the criteria for the test for relative extrema at a point (a, b), and ƒxx(a, b) > 0, while ƒyy(a, b) < 0. What does this tell you about ƒ(a, b)? Based on the sign of ƒxx(a, b) and ƒyy(a, b), why does this seem intuitively plausible?
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This tells us that a b is a saddle point The sign ...View the full answer
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