## What is Extreme Value?

When examining a given function, we frequently want to know its biggest and lowest values. Making accurate graphs requires this information. The ability to handle optimization issues like maximizing profit, limiting the quantity of material necessary to make an aluminum can, or determining the highest point a rocket may reach by determining the maximum and minimum values of a function has practical significance as well. In this section, we’ll look at how to utilize derivatives to determine a function’s biggest and smallest values.

## Extreme Value Theorem:

A continuous function that is defined in a closed interval can have its maxima and minima determined using the extreme value theorem. These extreme values would be found at the crucial points or at the ends of the closed interval.

The function’s derivative is 0 at important locations. Finding all of a function’s critical points and figuring out the values at these critical points is the initial step for any continuous closed interval function.

Evaluate the function on the interval’s endpoints as well. The maxima and minima of the function would represent its highest and lowest values, respectively. The online relative extrema calculator use the same theorem to find out the extreme values within seconds.

## Extreme Value Theorem: Application

The following steps outline how to use the extreme value theorem:

- A closed interval must be continuous for the function to be valid.
- Locate each and every crucial area of the function.
- Determine the function’s value at those crucial locations.
- Determine the function’s value based on the interval’s endpoints.
- The maxima and minima are the highest and lowest values, respectively, of all the calculated values.

## Extreme Value Theorem Validation

It must have a minimum upper bound in if is a continuous function in (by the Roundedness theorem). Let be the lowermost limit. We must demonstrate that, for a specific location in the closed interval,

By employing the contradicting technique, we shall demonstrate this.

Suppose there isn’t one where the maximum value exists.

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## Absolute Extrema

Think about the function f(x)=x2+1 over the range (,). As x→±∞,f(x)→∞. As a result, the function lacks a biggest value. But because x2+1=1 when x=0 and x2+11 for all real values x, the function has a minimum value of 1. We state that f(x)=x2+1 has an absolute minimum of 1, which happens at x=0. It is claimed that f(x)=x2+1 lacks an absolute maximum.

## Absolute Extrema Discovery

It’s time for this chapter’s first significant application of derivatives. The absolute extrema of a continuous function, f ( x ), on the interval [a, b], are what we are trying to find out. Many of the concepts that we looked at in the previous part will be necessary to do this.

First, the Extreme Value Theorem tells us that we can accomplish this since we have a closed interval (i.e., an interval that encompasses the endpoints) and we are assuming that the function is continuous. Naturally, this is a good thing. We don’t want to spend time looking for something that might not be there.

The presence of absolute extrema at endpoints or relative extrema was also demonstrated in the section prior. Additionally, we know from the preceding section that the list of crucial points also includes a list of every potential relative extremum. The list of all critical points and the endpoints will therefore also include a list of all potential absolute extrema.

Now that we’ve remembered that the largest and smallest values that a function will accept are the absolute extrema, all that’s left to do is compile a list of potential absolute extrema, insert these points into our function, and then determine the largest and smallest values.

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## FAQ’s

## How is Extreme Value Theorem Proven?

The contradiction and bounded theorem can be used to demonstrate the extreme value theorem. We can demonstrate that the function’s greatest value exists, and we can do the same for its smallest value.

## The Extreme Value Theorem Does Not Always Apply.

If the function is not continuous on the closed and bounded interval [a, b], the extreme value theorem cannot be used.

## The Extreme Value Theorem: How Does It Work?

The existence of the maximum and minimum values of a real-valued continuous function across a closed interval is demonstrated using the extreme value theorem. Once the maximum and minimum values are established, we may be requested to calculate them by taking the function’s derivative and identifying the key points. We determine the function’s value at crucial points as well as the interval’s maximum and minimum endpoints.