5. Set up the system of equations in the Method of Lagrange Multipliers for the function f(x, y, z) = xy + z and the constraint g(x, y, z) = x^4+ y^4+z^4=1. What must be true of a point (x, y, z) that satisfies those equations? Select one: a. z=0 b. x=y=0 c. X=y=z d. x=y or x=-y C e. y=4x^3
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- Find the minimum value of f (x, y) = xy subject to the constraint 5x - y = 4 in two ways: using Lagrange multipliers and setting y = 5x -4 in f(x,y).Solve max f( x,y , z) 3x2+y problem by means of Lagrange multipliers under the constraints of 4x-3y=9 and x2+z2=9. Explain what the values of Lagrange multipliers mean?Suppose that we want to optimize the function V = x2 + y2 + z3, subject to the restriction xyz = 4, using the Lagrange multipliers technique. If λ corresponds to the multiplier used when defining the Lagrange function, then one of the equations of the system to be solved corresponds to:
- A function, z = ax + by, is to be optimized subject to the constraint, x2 + y2=1 where a and b are positive constants. Use Lagrange multipliers to show that this problem has only one solution in the positive quadrant (i.e. in the region x > 0, y > 0) and that the optimal value of z is √a2 +b2.Consider the function f(x,y) = x^2 + y^2 subject to the constraint g(x, y) = x + y - 3 = 0. Use the Lagrange Multiplier method to find the minimum value of f(x, y) subject to the constraint g(x, y) = 0.The total cost function of a firm that produces its product on two assembly lines is given as: subject to the constraint: TC= 3X2+6y2 - XY subject to the constraint: X+Y = 20 The problem facing the firm is to determine the least-cost combination of output on assembly lines X and Y subject to the side condition that total output equal 20 units. (A)Use the Lagrangian multiplier method to determine X and Y that lead to the minimization of TC. (B) Verify that the values of X and Y minimize the TC, then Find the TC given the values of X and Y. (C)Interpret the value of the Lagrangian multiplier.
- Consider the function f(x, y, z) = x 3y + e yz . (a) Use Lagrange multipliers to write out a system of equations to solve for optimizing f subject to the constraint x 2 + y 2 = z 2 + 1. Call this System A. Do NOT attempt to solve your system. (b) Do the same thing for f subject to the constraint 3x 2 + 2y 2 + z 2 = 1. Call this System B. Again, do NOT attempt to solve your system. (c) Systems of n equations with n variables don’t always have solutions, but in this case we can guarantee that one of the systems you’ve written above must have a solution. Which is it and why? Hints: What points are your systems trying to find? What theorems do we have related to finding such points?16.Consider the autonomous system dxdt=y,dydt=x+2x3.dxdt=y,dydt=x+2x3. a.Show that the critical point (0, 0) is a saddle point. b.Sketch the trajectories for the corresponding linear system by integrating the equation for dy/dx. Show from the parametric form of the solution that the only trajectory on which x → 0, y → 0 as t → ∞ is y = −x. c.Determine the trajectories for the nonlinear system by integrating the equation for dy/dx. Sketch the trajectories for the nonlinear system that correspond to y = −x and y = x for the linear system.12.Consider the system dx/dt=x(a−σx−αy),dy/dt=y(−c+γx),dx/dt=xa−σx−αy,dy/dt=y−c+γx, where a, σ, α, c, and γ are positive constants. a.Find all critical points of the given system. How does their location change as σ increases from zero? Assume that a/σ > c/γ, that is, σ < aγ/c. Why is this assumption necessary? b.Determine the nature and stability characteristics of each critical point. c.Show that there is a value of σ between zero and aγ/c where the critical point in the interior of the first quadrant changes from a spiral point to a node. d.Describe the effect on the two populations as σ increases from zero to aγ/c.