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Chapter 4, Problem 1RCC

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Calculus: Early Transcendentals

8th Edition
James Stewart
ISBN: 9781285741550

Solutions

Chapter
Section
BuyFindarrow_forward

Calculus: Early Transcendentals

8th Edition
James Stewart
ISBN: 9781285741550
To determine

To explain: The difference between the absolute maximum and the local maximum.

Explanation

Absolute maximum:

A function f has an absolute maximum at c if f(c)f(x)x in the domain D of f. The number f(c) is called the maximum value of f on D.

Local maximum:

A function f has local minimum at c if there is an open interval I containing c (any x near to c) such that f(c)f(x)x in I.

Local maximum does not attain at extreme values.

Difference between the absolute maximum and the local maximum:

From the above definitions, the local maximum is any one of the maximum value available in the curve whereas the absolute maximum is the highest maximum of the curve. That is, the highest point of the curve is called as absolute maximum.

Therefore, it can be concluded that any absolute maximum is called as local maximum but not the vice versa.

Consider an example as shown below in Figure 1.

images

From Figure 1, it is observed that, f(5)f(x)x in R.

Thus, the absolute maximum of f(x) occurs at x=5 .

Also, it can be observed that, f(2)f(x)x for open interval (1,3) .

Thus, the local maximum of f(x) occurs at x=2 .

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