MAXIMUM AND MINIMUM VALUE WORD PROBLEMS USING DERIVATIVES

Optimization is a process of finding an extreme value (either maximum or minimum) under certain conditions.

A procedure for solving for an extremum or optimization problems.

Step 1 :

Draw an appropriate figure and label the quantities relevant to the problem.

Step 2 :

Find a expression for the quantity to be maximized or minimized.

Step 3 :

Using the given conditions of the problem, the quantity to be extremized .

Step 4 :

Determine the interval of possible values for this variable from the conditions given in the problem.

Step 5 :

Using the techniques of extremum (absolute extremum, first derivative test or second derivative test) obtain the maximum or minimum.

Problem 1 :

Find two positive numbers whose sum is 12 and their product is maximum.

Solution

Problem 2 :

Find two positive numbers whose product is 20 and their sum is minimum.

Problem 3 :

Find the smallest possible value of

x2 + y2

given that x + y =10.

Problem 4 :

A garden is to be laid out in a rectangular area and protected by wire fence. What is the largest possible area of the fenced garden with 40 meters of wire.

Problem 5 :

A rectangular page is to contain 24 cm2 of print. The margins at the top and bottom of the page are 1.5 cm and the margins at other sides of the page is 1 cm. What should be the dimensions of the page so that the area of the paper used is minimum.

Problem 6 :

A farmer plans to fence a rectangular pasture adjacent to a river. The pasture must contain 1,80,000 sq.mtrs in order to provide enough grass for herds. No fencing is needed along the river. What is the length of the minimum needed fencing material?

Problem 7 :

Find the dimensions of the rectangle with maximum area that can be inscribed in a circle of radius 10 cm.

Problem 8 :

Prove that among all the rectangles of the given perimeter, the square has the maximum area.

Solution

Problem 9 :

Find the dimensions of the largest rectangle that can be inscribed in a semi circle of radius r cm.

Problem 10 :

A manufacturer wants to design an open box having a square base and a surface area of 108 sq.cm. Determine the dimensions of the box for the maximum volume.

Problem 11 :

The volume of a cylinder is given by the formula

V  =  π r2h

Find the greatest and least values of V if r + h = 6.

Problem 12 :

A hollow cone with base radius a cm and height b cm is placed on a table. Show that the volume of the largest cylinder that can be hidden underneath is 4/times volume of the cone.

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