addison and kelsey are running on a path modeled by x^2+y^2-10x-18y-378=0, where the distance is in meters. what is the maximum distance between the runners at any given time

Respuesta :

The maximum distance is the diameter of the circle, which is of 44 units.

The equation of a circle of radius r and center [tex](x_0,y_0)[/tex] is given by:

[tex](x - x_0)^2 + (y - y_0)^2 = r^2[/tex]

  • The diameter is twice the radius, and is the maximum distance between two points inside a circle.

In this problem, the circular path is modeled by:

[tex]x^2 + y^2 - 10x - 18y - 378 = 0[/tex]

We complete the squares to place it in the standard format, thus:

[tex]x^2 - 10x + y^2 - 18y = 378[/tex]

[tex](x - 5)^2 + (y - 9)^2 = 378 + 25 + 81[/tex]

[tex](x - 5)^2 + (y - 9)^2 = 484[/tex]

Thus, the radius is:

[tex]r^2 = 484 \rightarrow r = \sqrt{484} = 22[/tex]

Then, the diameter is:

[tex]d = 2r = 2(22) = 44[/tex]

The maximum distance is the diameter of the circle, which is of 44 units.

A similar problem is given at https://brainly.com/question/24992361