BuyFind

Single Variable Calculus: Concepts...

4th Edition
James Stewart
Publisher: Cengage Learning
ISBN: 9781337687805
BuyFind

Single Variable Calculus: Concepts...

4th Edition
James Stewart
Publisher: Cengage Learning
ISBN: 9781337687805

Solutions

Chapter 2.7, Problem 42E
To determine

To Identify: The curves f,f,f and f on given graph and give proper explanation.

Expert Solution

Answer to Problem 42E

In the given graph,d=f, c=f, b=f and a=f.

Explanation of Solution

Graph:

The given graph is shown as in Figure 1,

Single Variable Calculus: Concepts and Contexts, Enhanced Edition, Chapter 2.7, Problem 42E

Observation:

Observe the graph of c and d carefully.

The point where c(x)=0 is the same point where graph of d(x) has horizontal tangent.

Recall that the derivative of a function is zero where the function has a horizontal tangent.

c(x) is the derivative of the graph d(x).

Thus, d(x)=c(x). (1)

Observe the graph of b and c carefully.

The slope of c has negative value when x<0. Only the curve b has negative value when x<0. Also, it is observed that the slope of c has positive value when x>0 while the curve b has positive value when x>0.

Thus, c(x)=b(x). (2)

Observe the graph of b and a carefully.

The slope of b has positive value when x{0}. Only the curve a has positive value when x.

Thus, b(x)=a(x). (3)

From (1), (2) and (3), it is concluded that, d(x)=a(x),d(x)=b(x) and d(x)=c(x)

Thus, d=f, c=f, b=f and a=f.

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