## How do you tell if a function has a global maximum?

Definition of Global Maximum and Global Minimum

Consider a function y=f(x), which is supposed to be continuous on a closed interval [a,b].

If there exists a point x0∈[a,b] such that f(x)≤f(x0) for all x∈[a,b], then we say that the function f(x) attains at x0 the maximum (greatest) value over the interval [a,b].

## What is a global maximum?

A global maximum, also known as an absolute maximum, the largest overall value of a set, function, etc., over its entire range. It is impossible to construct an algorithm that will find a global maximum for an arbitrary function. SEE ALSO: Global Minimum, Local Maximum, Maximum.

## How do you calculate global extreme values?

**Finding Absolute Extrema of f(x) on [a,b]**

- Verify that the function is continuous on the interval [a,b] .
- Find all critical points of f(x) that are in the interval [a,b] .
- Evaluate the function at the critical points found in step 1 and the end points.
- Identify the absolute extrema.

## What is the difference between local and global max and min?

A maximum or minimum is said to be local if it is the largest or smallest value of the function, respectively, within a given range. However, a maximum or minimum is said to be global if it is the largest or smallest value of the function, respectively, on the entire domain of a function.

## How do you know if local max or min?

Finding Local Maximum and Minimum Values of a Function –

## Can you have two global maximums?

Global (or Absolute) Maximum and Minimum

The maximum or minimum over the entire function is called an “Absolute” or “Global” maximum or minimum. There is only one global maximum (and one global minimum) but there can be more than one local maximum or minimum.

## How do you find the local minimum?

Finding Local Maximum and Minimum Values of a Function –

## How do you find the maximum point?

**How to Determine Maximum Value**

- If your equation is in the form ax2 + bx + c, you can find the maximum by using the equation:
- max = c – (b2 / 4a).
- The first step is to determine whether your equation gives a maximum or minimum.
- -x2 + 4x – 2.
- Since the term with the x2 is negative, you know there will be a maximum point.

## How do you find the absolute maximum and minimum of a function?

Finding Absolute Maximum and Minimum Values – Absolute

## How do you find the absolute maximum and local minimum?

Local and Absolute Maximum and Minimum from a Graph –

## How do you find the global maximum and minimum on an open interval?

Ex 2: Absolute Extrema on an Open Interval –