9. y- 6r - 10r - 5

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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144
Chapter 3: Derivatives
How to Read the Symbols for
Derivatives
If y" is differentiable, its derivative, y" = dy"/dx = d'y/dx', is the third derivative
of y with respect to x. The names continue as you imagine, with
y'
"y prime"
yla) - d ya-1)
yn-1) -
= D'y
y"
"y double prime"
dr"
d'y
"d squared y dx squared"
dr
denoting the nth derivative of y with respect to x for any positive integer n.
We can interpret the second derivative as the rate of change of the slope of the tangent
to the graph of y = f(x) at each point. You will see in the next chapter that the second
derivative reveals whether the graph bends upward or downward from the tangent line as
we move off the point of tangency. In the next section, we interpret both the second and
third derivatives in terms of motion along a straight line.
"y triple prime"
yin "y super n"
dy
* "d to the n of y by dx to the n"
dr"
The first four derivatives of y= x - 3x2 + 2 are
y = 3x - 6x
D
"D to the n"
EXAMPLE 10
First derivative:
Second derivative: y" = 6x – 6
Third derivative:
y" = 6
Fourth derivative: yld) = 0.
All polynomial functions have derivatives of all orders. In this example, the fifth and later
derivatives are all zero.
Exercises 3.3
Derivative Calculations
In Exercises 1-12, find the first and second derivatives.
1. y - -x + 3
1 + x - 4Vx
va)
25. v=
26. r= 2
Ve
+ Ve
2. y =x +x + 8
4. w - 32 - 7 + 212
(x+ )(x + 2)
(x - 1)(x - 2)
3. s- 5 - 3
27. y=
(x - 1) (x + x + 1)
28. y=
5. y =
4x
-x + 2e
6. y =+5+e
29. y= 2e + e
30. y=+ 3e
2e' - x
30. у
7. w = 3; -
8. s--2 +
31. y = x'e
33. y- x4 +
32. w-re
34. y-xS + 2
9. y = 6r - 10x - 5x
10. y = 4 - 2x - x
35. s= 212 + 3e
36, w -+ T
5
11. r=-
12. - 2-1 +!
12. r=
4
z14
Vz
3s
2s
37. y- V -
38. y- Vx"6 + 2el3
In Exercises 13-16, find y' (a) by applying the Product Rule and
(b) by multiplying the factors to produce a sum of simpler terms to
39. r=
+ 2)
40, r=
differentiate.
13. y = (3 - x) (x - x + 1) 14. y = (2r + 3)(5x - 4x)
D(x + 5 + !) 16. y = (1 + x*)(x4 – ")
Find the derivatives of all orders of the functions in Exercises 41-44.
15. y = (x + 1)x
16. y = (1 + x')(x4 - x*)
41. y =- - x
42. y=
2
120
43. y = (x - 1)(x + 2)(x + 3) 44. y = (4x? + 3X2 - x)x
Find the derivatives of the functions in Exercises 17-40.
18. =4- 3r
3x + x
2x + 5
Find the first and second derivatives of the functions in Exercises
17. y =
18. z=
Зх - 2
45-52.
19. glr) = - 4
x + 0.5
45. y = +1
? + 5r – 1
20. f) =+t-2
46. s=
19. g(x)-
2 +- 2
21. v- (1 - n(1 + )-
22. w = (2x - 7)x + 5)
(0 - )(0 + 0 + 1)
(x + xMx - x + I)
47. r
48. u=
23, fr) - V - I
Vs +1
Sx + 1
23. f(s) -
24. -
q + 3
1-1+ (q + 1)
I
+ 32
3- 2)
49. w-
50. р
32
(9 -
Transcribed Image Text:144 Chapter 3: Derivatives How to Read the Symbols for Derivatives If y" is differentiable, its derivative, y" = dy"/dx = d'y/dx', is the third derivative of y with respect to x. The names continue as you imagine, with y' "y prime" yla) - d ya-1) yn-1) - = D'y y" "y double prime" dr" d'y "d squared y dx squared" dr denoting the nth derivative of y with respect to x for any positive integer n. We can interpret the second derivative as the rate of change of the slope of the tangent to the graph of y = f(x) at each point. You will see in the next chapter that the second derivative reveals whether the graph bends upward or downward from the tangent line as we move off the point of tangency. In the next section, we interpret both the second and third derivatives in terms of motion along a straight line. "y triple prime" yin "y super n" dy * "d to the n of y by dx to the n" dr" The first four derivatives of y= x - 3x2 + 2 are y = 3x - 6x D "D to the n" EXAMPLE 10 First derivative: Second derivative: y" = 6x – 6 Third derivative: y" = 6 Fourth derivative: yld) = 0. All polynomial functions have derivatives of all orders. In this example, the fifth and later derivatives are all zero. Exercises 3.3 Derivative Calculations In Exercises 1-12, find the first and second derivatives. 1. y - -x + 3 1 + x - 4Vx va) 25. v= 26. r= 2 Ve + Ve 2. y =x +x + 8 4. w - 32 - 7 + 212 (x+ )(x + 2) (x - 1)(x - 2) 3. s- 5 - 3 27. y= (x - 1) (x + x + 1) 28. y= 5. y = 4x -x + 2e 6. y =+5+e 29. y= 2e + e 30. y=+ 3e 2e' - x 30. у 7. w = 3; - 8. s--2 + 31. y = x'e 33. y- x4 + 32. w-re 34. y-xS + 2 9. y = 6r - 10x - 5x 10. y = 4 - 2x - x 35. s= 212 + 3e 36, w -+ T 5 11. r=- 12. - 2-1 +! 12. r= 4 z14 Vz 3s 2s 37. y- V - 38. y- Vx"6 + 2el3 In Exercises 13-16, find y' (a) by applying the Product Rule and (b) by multiplying the factors to produce a sum of simpler terms to 39. r= + 2) 40, r= differentiate. 13. y = (3 - x) (x - x + 1) 14. y = (2r + 3)(5x - 4x) D(x + 5 + !) 16. y = (1 + x*)(x4 – ") Find the derivatives of all orders of the functions in Exercises 41-44. 15. y = (x + 1)x 16. y = (1 + x')(x4 - x*) 41. y =- - x 42. y= 2 120 43. y = (x - 1)(x + 2)(x + 3) 44. y = (4x? + 3X2 - x)x Find the derivatives of the functions in Exercises 17-40. 18. =4- 3r 3x + x 2x + 5 Find the first and second derivatives of the functions in Exercises 17. y = 18. z= Зх - 2 45-52. 19. glr) = - 4 x + 0.5 45. y = +1 ? + 5r – 1 20. f) =+t-2 46. s= 19. g(x)- 2 +- 2 21. v- (1 - n(1 + )- 22. w = (2x - 7)x + 5) (0 - )(0 + 0 + 1) (x + xMx - x + I) 47. r 48. u= 23, fr) - V - I Vs +1 Sx + 1 23. f(s) - 24. - q + 3 1-1+ (q + 1) I + 32 3- 2) 49. w- 50. р 32 (9 -
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