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Mathematical Applications for the ...

11th Edition
Ronald J. Harshbarger + 1 other
ISBN: 9781305108042

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BuyFindarrow_forward

Mathematical Applications for the ...

11th Edition
Ronald J. Harshbarger + 1 other
ISBN: 9781305108042
Textbook Problem

Find the relative maxima, relative minima, and points of inflection and sketch the graphs of the functions in Problems 15-20.

y = x 2 4 x + 2

To determine

To calculate: The relative minimum, relative maximum and points of infection for the provided function y=x24x+2.

Explanation

Given Information:

The provided function is,

y=x24x+2

Formula used:

To find relative maxima and minima of a function,

1. Find the critical values of a function.

2. Substitute the critical values into f(x) to find the critical points.

3. Evaluate f(x) at each critical value for which f(x)=0.

(a) If f(x0)<0, a relative maximum occurs at x0.

(b) If f(x0)>0, a relative minimum occurs at x0.

(c) If f(x0)=0 or f(x0) is undefined, the second derivative test fails and then use the first derivative test.

Calculation:

Consider the provided function,

y=x24x+2

Now, obtain the first derivative as,

y=x24x+2y=2x4

Now, to obtain the critical values, set y=0 as,

2x4=02x=4x=2

Substitute 2 for x in the provided function as,

y=(2)24(2)+2=48+2=4+2=2

Thus, the critical point is (2,2).

Now, obtain the second derivative as,

y=2x4

Differentiate the function with respect to x,

y=2

Since, y>0 for all x, therefore, relative minimum occurs at (2,2).

And also, as y(x) cannot be zero, so there is no point of inflection

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Chapter 10 Solutions

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