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Question -

Find two positive numbers whose sum is 16 and the sum ofwhose cubes is minimum.



Answer -

Let one number be┬аx. Then, theother number is (16 тИТ┬аx).

Let the sum of the cubes of these numbers bedenoted by S(x). Then,

Now,┬а

тИ┤ By second derivative test,┬аx┬а= 8 is thepoint of local minima of┬аS.

Hence, the sum of the cubes of the numbers is the minimumwhen the numbers are 8 and 16 тИТ 8 = 8.

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