Chapter 12: Q 15. (page 916)
In Exercise, provide a rough sketch of the graph of a function of two variables with the specified level 鈥渃urve(s).鈥
One level curve is a circle together with the point that is the center of the circle.
Short Answer

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Chapter 12: Q 15. (page 916)
In Exercise, provide a rough sketch of the graph of a function of two variables with the specified level 鈥渃urve(s).鈥
One level curve is a circle together with the point that is the center of the circle.

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In Exercises, by considering the function subject to the constraint you will explore a situation in which the method of Lagrange multipliers does not provide an extremum of a function.
Show that the only point given by the method of Lagrange multipliers for the function subject to the constraint
Partial derivatives: Find all first- and second-order partial derivatives for the following functions:
Consider the function f(x, y) = 2x + 3y.
(a) Why is the graph of f a plane?
(b) In what direction is f increasing most rapidly at the
point (鈭1, 4)?
(c) In what direction is f increasing most rapidly at the
point (x 0, y 0)?
(d) Why are your answers to parts (b) and (c) the same?
Use Theorem 12.32 to find the indicated derivatives in Exercises 21鈥26. Express your answers as functions of a single variable.
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