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Derivatives of Polynomials and Exponential 3.1 Functions
2 
Derivative of a Constant Function 
f (x) = c. 
The graph is 
the horizontal line y = c, 
which has slope 0, so we 
must have f '(x) = 0. 
Figure 1 
The graph of f (x) = c is the 
line y = c, so f ¢(x) = 0.
3 
Derivative of a Constant Function
4 
Exercise – Constant Multiple Rule 
Find y’ if y = π
5 
Power Rule
6 
Example 1 – Using the Power Rule 
(a) If f (x) = x6, then f ¢(x) = 6x5. 
(b) If y = x1000, then y ¢= 1000x999. 
(c) If y = t 
4, then = 4t 
3. 
(d) = 3r 
2
7 
Exercises – Power Rule
8 
Constant Multiple Rule
Example 4 – Using the Constant Multiple Rule 
9
10 
Sum Rule
11 
Difference Rule 
By writing f – g as f + (–1)g and applying the Sum Rule and 
the Constant Multiple Rule, we get the following formula. 
The Constant Multiple Rule, the Sum Rule, and the 
Difference Rule can be combined with the Power Rule to 
differentiate any polynomial, as the following examples 
demonstrate.
12 
Derivatives of Polynomials
Derivatives of Polynomials-Exercise 
13
14 
Exponential Functions
15 
Example 8 
If f (x) = ex – x, find f ¢. Compare the graphs of f and f ¢. 
Solution: 
Using the Difference Rule, we have
16 
Example 8 – Solution 
The function f and its derivative f ¢ are graphed in Figure 8. 
cont’d 
Figure 8
17 
Example 8 – Solution 
Notice that f has a horizontal tangent when x = 0; this 
corresponds to the fact that f ¢(0) = 0. Notice also that, for 
x > 0, f ¢(x) is positive and f is increasing. 
When x < 0, f ¢(x) is negative and f is decreasing. 
cont’d
18 
Derivative of Exponential-Exercise
19 
Higher Derivatives
Higher Derivatives 
Second derivative of f is the derivative of the derivative of f 
20 
(f ′)′ = f ′′. 
Using Leibniz notation, we write the second derivative of 
y = f (x) as
21 
Example 7 
If f (x) = x3 – x, find f ′′(x). 
Solution:
Higher Derivatives - Acceleration 
The instantaneous rate of change of velocity with respect to time is 
called the acceleration a(t) of the object. Thus the acceleration 
function is the derivative of the velocity function 
and is therefore the second derivative of the position function: 
22 
a(t) = v ′(t) = s ′′(t) 
or, in Leibniz notation,
23 
Higher Derivatives 
The process can be continued. The fourth derivative f ′′′′ is 
usually denoted by f (4). 
In general, the nth derivative of f is denoted by f (n) and is 
obtained from f by differentiating n times. 
If y = f (x), we write
24 
Higher Derivatives - Exercises

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Lecture 8 power & exp rules

  • 1. Derivatives of Polynomials and Exponential 3.1 Functions
  • 2. 2 Derivative of a Constant Function f (x) = c. The graph is the horizontal line y = c, which has slope 0, so we must have f '(x) = 0. Figure 1 The graph of f (x) = c is the line y = c, so f ¢(x) = 0.
  • 3. 3 Derivative of a Constant Function
  • 4. 4 Exercise – Constant Multiple Rule Find y’ if y = π
  • 6. 6 Example 1 – Using the Power Rule (a) If f (x) = x6, then f ¢(x) = 6x5. (b) If y = x1000, then y ¢= 1000x999. (c) If y = t 4, then = 4t 3. (d) = 3r 2
  • 7. 7 Exercises – Power Rule
  • 9. Example 4 – Using the Constant Multiple Rule 9
  • 11. 11 Difference Rule By writing f – g as f + (–1)g and applying the Sum Rule and the Constant Multiple Rule, we get the following formula. The Constant Multiple Rule, the Sum Rule, and the Difference Rule can be combined with the Power Rule to differentiate any polynomial, as the following examples demonstrate.
  • 12. 12 Derivatives of Polynomials
  • 15. 15 Example 8 If f (x) = ex – x, find f ¢. Compare the graphs of f and f ¢. Solution: Using the Difference Rule, we have
  • 16. 16 Example 8 – Solution The function f and its derivative f ¢ are graphed in Figure 8. cont’d Figure 8
  • 17. 17 Example 8 – Solution Notice that f has a horizontal tangent when x = 0; this corresponds to the fact that f ¢(0) = 0. Notice also that, for x > 0, f ¢(x) is positive and f is increasing. When x < 0, f ¢(x) is negative and f is decreasing. cont’d
  • 18. 18 Derivative of Exponential-Exercise
  • 20. Higher Derivatives Second derivative of f is the derivative of the derivative of f 20 (f ′)′ = f ′′. Using Leibniz notation, we write the second derivative of y = f (x) as
  • 21. 21 Example 7 If f (x) = x3 – x, find f ′′(x). Solution:
  • 22. Higher Derivatives - Acceleration The instantaneous rate of change of velocity with respect to time is called the acceleration a(t) of the object. Thus the acceleration function is the derivative of the velocity function and is therefore the second derivative of the position function: 22 a(t) = v ′(t) = s ′′(t) or, in Leibniz notation,
  • 23. 23 Higher Derivatives The process can be continued. The fourth derivative f ′′′′ is usually denoted by f (4). In general, the nth derivative of f is denoted by f (n) and is obtained from f by differentiating n times. If y = f (x), we write
  • 24. 24 Higher Derivatives - Exercises