Chapter 12: Q. 67 (page 945)
Chapter 12: Q. 67 (page 945)
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Get started for freeIn 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
Let T be a triangle with side lengths a, b, and c. The semi-perimeter of T is defined to be Heron’s formula for the area A of a triangle is
Use Heron’s formula and the method of Lagrange multipliers to prove that, for a triangle with perimeter P, the equilateral triangle maximizes the area.
In Exercises 21–26, find the discriminant of the given function.
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In Exercises, find the maximum and minimum of the function f subject to the given constraint. In each case explain why the maximum and minimum must both exist.
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 (−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?
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