179k views
3 votes
Given the function f(x,y)=eˣʸ and the curve x²+y²=2:

1. Find the point(s) on the intersection between the function and the curve where the function f takes its maximum value. Compute that maximum value of the function f.
2. Find the point(s) on the intersection between the function and the curve where the function f takes its minimum value. Compute that minimum value of the function f.

User Jon Shea
by
8.6k points

1 Answer

4 votes

Final answer:

The maximum value of the function f(x,y)=e^{xy} on the curve x^2+y^2=2 occurs at points (1,1) and (-1,-1), with a value of e. The minimum value occurs at points (1,-1) and (-1,1), with a value of 1/e.

Step-by-step explanation:

To find the points on the intersection of the function f(x,y)=e^{xy} and the curve x^2+y^2=2 where the function f takes its maximum and minimum values, we need to consider the behavior of the exponential function. Since e^{xy} is always positive, it reaches its maximum value when the exponent xy is as large as possible given the constraint that x^2+y^2=2.

To maximize xy under the given constraint, we can use calculus methods such as Lagrange multipliers or simply inspect the symmetry of the circle represented by x^2+y^2=2. This yields the points (1,1) and (-1,-1) where the maximum function value occurs. The maximum value at these points is e.

Similarly, to minimize the function f we look for the minimum value of xy, which happens at points (1,-1) and (-1,1) on the circle, yielding the minimum value of 1/e.

User Naresh Sharma
by
7.9k points