Absolute Minimum and Maximum Word Problem

In summary, the task is to find a number in the closed interval [1/2, 3/2] that will result in the smallest or largest sum when added to its reciprocal. The answer for part (a) is 1 while the answer for part (b) is 1/2. The suggested approach is to set the derivative equal to zero and find the zeroes for the derivatives, while also checking the endpoints.
  • #1
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Homework Statement


Find a number in the closed interval [1/2, 3/2] such that the sum of the number and its reciprocal is
(a)as small as possible
(b) as large as possible

I am given the answer in the back of the book
The answer to a is 1
The answer to be is 1/2




Homework Equations


Here is my equation

S= x + 1/x

dS/dx = 1-1/x^2

The Attempt at a Solution


I was wondering if i should set the derivative equal to zero and find the zeroes for the derivatives?
 
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  • #2
Absolutely, you should do that. That will give the locations of the local extrema. And don't forget to check the endpoints as well.
 
Last edited:

What is an "Absolute Minimum and Maximum Word Problem"?

An "Absolute Minimum and Maximum Word Problem" is a type of word problem in mathematics that involves finding the smallest and largest possible value of a given function within a specific domain or interval.

How do you solve an "Absolute Minimum and Maximum Word Problem"?

To solve an "Absolute Minimum and Maximum Word Problem", you must first identify the function and the domain or interval for which you are trying to find the absolute minimum and maximum values. Then, you can use differentiation and critical point analysis to determine the local minimum and maximum points. Finally, you must compare those points to the endpoints of the interval to find the absolute minimum and maximum values.

What is the difference between absolute and relative extrema?

Absolute extrema refer to the largest and smallest values of a function within a given domain or interval, while relative extrema refer to the largest and smallest values of a function within a specific region or range. Absolute extrema are also known as global extrema, while relative extrema are also known as local extrema.

Why are "Absolute Minimum and Maximum Word Problems" important?

"Absolute Minimum and Maximum Word Problems" are important because they allow us to find the optimal values of a function within a given interval, which can be useful in real-world applications such as optimization and decision-making.

Can "Absolute Minimum and Maximum Word Problems" have multiple solutions?

Yes, "Absolute Minimum and Maximum Word Problems" can have multiple solutions, especially if the function is not continuous or has multiple critical points within the given interval. However, there can only be one absolute minimum and one absolute maximum value for a given function and interval.

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