### Home > PC > Chapter 9 > Lesson 9.3.2 > Problem 9-114

9-114.

A rectangular corral is to be built using

Sketch the situation.

Write an equation for the area of the corral as a function of

, the length of the side perpendicular to the river.

Area

Graph this function.

Which value of

gives you the maximum area?What is the slope of the tangent line to the area graph at this point?

Slope of the tangent line is

.