section 1–1 8. 9. x y x y - folsom lake collegeflc.losrios.edu/~eitel/all pdfs/m-400 pdfs/m-400...
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Calculus 400 Chapter 1 AnswersSection 1–11. Domain = { –2, 0 ,2 ,3 } Range = { 2, 3 } Function? Yes!2. Domain = { 1, 2, 3 } Range = { 3, 5,7 } Function? No3. Domain = { –5, –4, –2, 2, 6 } Range = { –5, –2 ,3 } Function? Yes4. Domain = { –1, 0 , 1, 2 } Range = { –6, –3, 0, 7 } Function? No!5. A, D, E ! 6. B, C, D, F! 7. A , B , C , E , H , L 8.! ! 9.! !Domain:
�
x ∈ −5,4[ ]! Domain:
�
x ∈ −5,5[ ) !Range:
�
y ∈ −2,5[ ]! Range:
�
y ∈ −4,5( ]! !10.! ! 11.! ! !Domain: x∈ −3,4( ) ! Domain: x∈ −5,−2[ )∪ 2,5( ] ! ! !
Range: y∈ −4,5[ ) ! Range: y∈ −5,−1[ )∪ −1,4( ]12.! ! 13.Domain:
�
x ∈ −5,+∞[ )! Domain:
�
x ∈ −5,+∞( )
Range:
�
8 ∈ −∞,5[ )! Range:
�
y ∈ −5,+∞[ )
14 Domain:
�
{ x ∈ Reals | x ≠ ± 3 , 0 } ! 15. Domain:
�
x ∈ Reals | x ≠ −3 / 2 or 4 / 3{ }
16 Domain:
�
x ∈ Reals | x ≤ 2{ }! 17. Domain:
�
x ∈ Reals | x ≥ 2 , x ≠ 10{ }18 Domain: x ∈ Reals | x< 3{ } ! 19. Domain:
�
x ∈ Reals | x ≥ 2 , x ≠ 10{ }18. Domain: x ∈ Reals | x<3 { } ! 19. Domain: x ∈ Reals | x ≥ 5{ }
20. Domain: x ∈ Reals | x > − 3 { } ! 21. Domain: x ∈ Reals | x < 4 { } !22. 20! 23. 4! 24.
�
2 3 ! 25. –7
26. –1! 27. 72! 28. 0! 29. 1 !
30A.
�
( f + g)(x) = 2x2 + 5x − 8 ! 30B.
�
( f + g)(1) = −1! 30C. Domain of
�
( f + g)(x) =
�
x ∈(−∞,+∞)
31A.
�
( f − g)(x) = 6x2 − 9x +10 ! 31B.
�
( f − g)(3) = 37 ! 31C. Domain of
�
( f + g)(x) =
�
x ∈(−∞,+∞)
32A.
�
f g( )(x) = 12x3 + 6x3 − 4x − 2! 32B.
�
h f( )(x) = 8x2 −16x −10!
Domain of
�
f g( )(x) =
�
x ∈(−∞,+∞)! Domain of
�
h f( )(x) =
�
x ∈(−∞,+∞)
33 A.
�
fg
⎛ ⎝ ⎜
⎞ ⎠ ⎟ (x) =
−12x − 5 ! 33B.
�
fg
⎛ ⎝ ⎜
⎞ ⎠ ⎟ (x) = −2x + 5!
Domain
�
x ∈ℜ | x ≠ ±2 / 5! Domain
�
x ∈ℜ | x ≠ −5 / 2
Math 400 Chapter 1 Answers! Page 1 of 20 ! © 2018 Eitel
34A.
�
fg
⎛ ⎝ ⎜
⎞ ⎠ ⎟ (x) = 3x + 4 ! 34B.
�
gf
⎛ ⎝ ⎜
⎞ ⎠ ⎟ (x) =
13x + 4
!
Domain
�
x ∈ℜ | x ≠ 1 / 6! Domain
�
x ∈ℜ | x ≠ 1 / 6 or − 4 / 3
35A.
�
g( f (x)) = −4x2 + 20x − 23! 35B.
�
f (g(x)) = −2x2 −1!35C.
�
f ( f (x)) = 4x −15! 35D.
�
g(g(x)) = −x2 + 4x − 2
36A.
�
f (g(x)) = x ! 36B.
�
g( f (x)) = x
37. Even functions: A, C, H, K, L Odd Functions: D, G, I Neither: B, E, F. J38. Even 39. Odd ! 40. Odd! 41. Neither!
41. B, D, F, G, H , I, K
42.
�
f −1(x) =6x − 3
4 or f −1(x) =
3x2
−34! 43.
�
f −1(x) = x − 23
44. f−1(x) = x − 53 + 2 ! 45.
�
f (x) = x 2 for x ≥ 0
46.
�
f −1(x) =−3x + 2
x ! 47.
�
f −1(x) =x
3x −1
48. f−1(x) = 1x − 3
! 49.
�
f −1(x) =4x − 3x − 2
50. f−1(x) = 3x + 4x −1
! 51.
�
f −1(x) =3
3x −1 for y ≥ 0
53.
�
y + 4( ) = −2 x +1( ) or
�
y − 4( ) = −2 x + 5( ) 54.
�
y + 4( ) =−15
x − 4( ) or
�
y + 3( ) =−15
x +1( ) !
55.
�
y =12x +1! 56.
�
y =13x −1! ! 57
�
y = −3! 58.
�
x = 4!
Section 1– 2
1.
�
x ∈ℜ: x ∈ −∞,−4]( or −1,2[ ] ! 2.
�
x ∈ℜ: x ∈ −2,−1[ ] or x = 0
–1 –4 2 ! –1 –2 0 !
3.
�
x ∈ℜ: x ∈ −∞,−2( ) or 3,∞( ) ! 4.
�
x ∈ℜ: x ∈ −∞,−2)( or 0,3)(
–2 3 ! !
5.
�
x ∈ ℜ: x = −5 or x ∈ 0,1[ ]! 6.
�
x ∈ ℜ: x ∈ −∞,0( ]
–5 1 0 ! 0
Math 400 Chapter 1 Answers! Page 2 of 20 ! © 2018 Eitel
7.
�
x ∈ ℜ: x = −5 or x = 1 ! 8.
�
x ∈ ℜ: x ∈ −∞ ,0)( or 0,1)( or 4,∞)(
1–5 !
9 .
�
x ∈ℜ: x ∈ 3.∞[ ) or x =1 or x = −2 ! 10. No real Numbers
3! !11.
�
x ∈ℜ: x ∈ −∞,−3( ] or 16,∞[ ) or 0 ! 12.
�
x ∈ ℜ: x ∈ −∞,−3( ] or 0,6[ ]
!13.
�
x ∈ ℜ: x ∈ 0 ,∞( ) ! 14.
�
x ∈ ℜ: x ∈ −∞,4( ] or 7,∞[ )
0 ! 4 7
15.
�
x ∈ ℜ: x ∈ −∞,−3( ) or 2,∞[ ) ! 16.
�
x ∈ℜ: x ∈ −5,−1[ ) or 1,∞( )
–3 2 ! 1 –1–5
17.
�
x ∈ ℜ: x ∈ −∞,0( ) or 3,5( ) ! 18.
�
x ∈ ℜ: x ∈ −∞,−4( ) or 2,∞( )
0 3 5 ! 2–4
19.
�
x ∈ ℜ: x ∈ 5,∞( ) ! 20
�
x ∈ ℜ: x ∈ −∞,−4( ] or −2,1( ] or 2,∞( )
5 ! –2 1 2 –4
21.
�
x ∈ ℜ: x ∈ −∞,0( ] or 1,3[ ) or 3,∞( ) ! 22.
�
x ∈ ℜ: x ∈ −2,∞[ )
1 3 0 ! –2
Section 1– 3
1)
�
y = x2 +1! 2)
�
y = (x − 2)2 ! 3)
�
y = (x −1)2 − 3
Math 400 Chapter 1 Answers! Page 3 of 20 ! © 2018 Eitel
!
( 0, 2 )
!( 1 , –3)
4)
�
y = −x2 ! 5)
�
y = (x + 3)2 +1! 6)
�
y = x + 2
!
( –2 ,0 )
!7)
�
y = x − 3 ! 8)
�
y = − − x ! 9)
�
y = x + 2 + 1
( 3 , 0 )
!
( –2 , 1 )
10)
�
y = x + 3 ! 11)
�
y = x + 2 −1! 12)
�
y = − −x
13)
�
y = −x + 4 ! 14)
�
y = − x ! 15)
�
y = x −1 − 2
Math 400 Chapter 1 Answers! Page 4 of 20 ! © 2018 Eitel
( 0, 4 )
! !
16)
�
y = (x − 4)3! 17)
�
y = x3 − 3! 18)
�
y = (x + 3)3 −1
19)
�
y = (x − 2)3 −1 ! 20)
�
y = −x3! 21)
�
y = −x3 −1
!
22)
�
y = x − 23 ! 23)
�
y = x3 −1! 24)
�
y = x +13
!
25)
�
y = − x3 ! 26)
�
y = − −x3 ! 27)
�
y = x − 23 +1
Math 400 Chapter 1 Answers! Page 5 of 20 ! © 2018 Eitel
! ! 28)
�
y = 1x! 29)
�
y = 4x! 30)
�
y = 1x − 2
! !
31)
�
y =1x−1! 32)
�
y =3
x + 2! 33)
�
y =−3x
! !
34)
�
y =1x2! 35)
�
y =−2x2! 36)
�
y =1
(−x)2
! !37)
�
y = x2 for
�
x ≥ 0! 38)
�
y = x 2 for
�
x ≥ −2! 39)
�
y = x2 for
�
x < 1
Math 400 Chapter 1 Answers! Page 6 of 20 ! © 2018 Eitel
!
(–2 , 4)
!
(1 , 1)
40)
�
y = x for
�
x ≥ 1! 41.
�
y = x for
�
x < 2! 42)
�
y = x for
�
x < −1
(1 , 1)
!
(2 , 2)
!
43)
�
y = x3 for
�
x < 1! 44)
�
y = x 3 for
�
x ≥ −1! 45)
�
y = x 3 for
�
x < −1
!
( –1, –1)
!
( –1, –1)
!
46)
�
y = x3 for
�
x ≤ 1! 47)
�
y = x3 for
�
x > −1! 48)
�
y = x3 for
�
x ≤ −1
( 1, 1)
!
( –1, –1)
!
( –1, –1)
Math 400 Chapter 1 Answers! Page 7 of 20 ! © 2018 Eitel
49.
�
f (x) =x + 1 if x > 3−2x + 7 if x ≤ 3⎧ ⎨ ⎩
! ! 50.
�
g(x) =x + 3 if x > 1−2x + 6 if x ≤1⎧ ⎨ ⎩
!
(3 , 1)�
y = −2x + 7
�
y = x +1
(3 , 4)
!
(1,4)�
y = −2x + 6
�
y = x +1
51.
�
h(x) =−x + 5 if x ≥ 23 if x < 2
⎧ ⎨ ⎩
! 52.
�
m(x) =−2x + 8 if x > 2 x if x ≤ 2
⎧ ⎨ ⎩
!
(2,3)
�
y = 3
�
y = −x + 4
!
(2,2)
�
y = x
�
y = −2x + 8
(2 , 4)
53.
�
h(x) = x2 + 2 if x > 12x + 1 if x ≤1
⎧ ⎨ ⎩
! 54.
�
g(x) = −x2 + 4 if x ≥ 1−x + 2 if x < 1
⎧ ⎨ ⎩
!
(1,3)
�
y = 2x +1
�
y = x2 + 2
!
(1,3)
�
y = −x + 2
(1,1)
Math 400 Chapter 1 Answers! Page 8 of 20 ! © 2018 Eitel
55.
�
h(x) =
x − 2 if x > −3
−13x if x ≤ −3
⎧
⎨ ⎪ ⎪
⎩ ⎪ ⎪
! 56.
�
m(x) =x + 3 if x > 1
−x2 + 1 if x ≤ 1
⎧
⎨ ⎪
⎩ ⎪
!
�
y =−13x
(–3 , 1)
�
y = x − 2
!
�
y = −x2 +1
1,0)
1,4)
57.
�
h(x) =x if x ≥ 0
(x + 1)2 if x < 0⎧ ⎨ ⎩
! 58
�
h(x) = x2 if x ≥ −1−x if x < −1
⎧ ⎨ ⎩
!
�
y = x −1)2( )�
y = x(0,1
!
(–1,1)
!
59.
�
w(x) = x3 if x ≥ 0− −x if x < 0
⎧ ⎨ ⎩
! 60.
�
w(x) = x3 − 5 if x ≥ 2−x2 + 3 if x < 2
⎧ ⎨ ⎩
!
�
y = − −x
�
y = x3
!
Math 400 Chapter 1 Answers! Page 9 of 20 ! © 2018 Eitel
61. f (x) =x2 +12x +1−x2
⎧
⎨ ⎪
⎩ ⎪
�
if x > 2if −1< xif x ≤ −1
≤ 2! 62.
�
f (x) =x2 − 52x − 4x2 −1
⎧
⎨ ⎪
⎩ ⎪
�
if x ≥ 3if −1≤ xif x ≤ −1
< 3!
�
y = x2 +1( 2 , 5)
�
y = −x2( –1 , –1)�
y = 2x +1
!
�
y = x2 − 5( 3 , 4)
�
y = x2 −1( –1,–2)
�
y = 2x − 4
( 3 , 2)
( –1, –6)
63.
�
f (x) =x +14
−x −1
⎧ ⎨ ⎪
⎩ ⎪
�
if x > 2 if − 3 < xif x ≤− 3
≤ 2! 64.
�
f (x) =x3
42x + 3
⎧
⎨ ⎪
⎩ ⎪
�
if x > 0if x = 0if x < 0
!
�
y = −x −1
�
y = 4
(2,3)(–3,2)
(2,4)
�
y = x +1
(–3,4)
!
�
y = 2x + 3
(0,3)
�
y = x3(0,4)
65.
�
f (x) =x2 +15
−x +1
⎧
⎨ ⎪
⎩ ⎪
�
if x > −1if x = −1if x < −1
! 66.
�
f (x) =−x2 + 32
−2x + 4
⎧
⎨ ⎪
⎩ ⎪
�
if x > 1if x = 1if x < 1
Math 400 Chapter 1 Answers! Page 10 of 20 ! © 2018 Eitel
�
y = x2 +1
�
y = −x +1
( –1, 5)
( –1, 2)
!
�
y = −x2 + 3
�
y = −2x + 4( 1, 2)
67)
�
y = 3x ! 68)
�
y = 3x+2 ! 69)
�
y = 3x − 2
Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ
Range:
�
y ∈ 0,+∞( ) or ℜ+ ! Range:
�
y ∈ 0,+∞( ) or ℜ+ ! Range:
�
y ∈ −2,+∞( )
70) !
�
y = (1 / 2)x ! 71) ! 72)
�
y = (1 / 3)x−2
Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ
Range:
�
y ∈ 0,+∞( ) or ℜ+ ! Range:
�
y ∈ 0,+∞( ) or ℜ+ ! Range:
�
y ∈ 2,+∞( )
73) !
�
y = (1/ 3)x + 2 ! 74)
�
y = e x ! 75)
�
y = e−x
Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ
Range:
�
y ∈ 2,+∞( ) ! Range:
�
y ∈ 0,+∞( ) or ℜ+ ! Range:
�
y ∈ 0,+∞( ) or ℜ+
Math 400 Chapter 1 Answers! Page 11 of 20 ! © 2018 Eitel
76)
�
y = −e−x ! 77)
�
y = ex+3! 78)
�
y = ex − 3
Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ ! Domain:
�
x ∈ −∞,+∞( ) or ℜ
Range:
�
y ∈ -∞,0( ) or ℜ− ! Range:
�
y ∈ 0,+∞( ) or ℜ+ ! Range:
�
y ∈ −3,+∞( )
79)
�
y = ln(x) ! 80)
�
y = ln(−x) ! 81)
�
y = ln x +1( )
Domain:
�
x ∈ 0,+∞( ) or ℜ+ ! Domain:
�
x ∈ −∞,0( ) or ℜ− ! Domain:
�
x ∈ −1,+∞( ) Range:
�
x ∈ −∞,+∞( ) or ℜ ! Range:
�
x ∈ −∞,+∞( ) or ℜ ! Range:
�
x ∈ −∞,+∞( ) or ℜ
! !
82
�
y = log(1/2) x ! 83)
�
y = −log(1/3) x ! 84)
�
y = log(1/2)(x) + 2
Domain:
�
x ∈ 0,+∞( ) or ℜ+! Domain:
�
x ∈ 0,+∞( ) or ℜ+! Domain:
�
x ∈ 0,+∞( ) or ℜ+
Range:
�
x ∈ −∞,+∞( ) or ℜ ! Range:
�
x ∈ −∞,+∞( ) or ℜ ! Range:
�
x ∈ −∞,+∞( ) or ℜ
Math 400 Chapter 1 Answers! Page 12 of 20 ! © 2018 Eitel
! !
85.
�
y =xx! 86.
�
y =− xx
! 87.
�
y =− x−x
x
y
!
x
y
!
x
y
88.
�
y =2xx ! 89.
�
y =xx
− 2! 90.
�
y =xx
+1
x
y
!
x
y
!
x
y
1 – 4: Trig Review Answers
1. 32! 2.
�
33! 3.
�
12! 4.
�
−2 33
! 5. –1! 6.
�
−2 33
Math 400 Chapter 1 Answers! Page 13 of 20 ! © 2018 Eitel
7. 0! 8. 1! 9. undefined ! 10. 1! 11. 2! 12.
�
− 22
13.
�
− 32
! 14. − 2 ! 15.
�
12 ! 16. undefined ! 17.
�
2 33
! 18. –2!
19. 1! 20. –1! 21. 0! 22.
�
− 22 ! 23.
�
− 3 ! 24. 1!
25. undefined ! 26. 1! 27.
�
2 33 ! 28.
�
12 ! 29. 3
2! 30. 0!
31. −12! 32.
�
− 32 ! 33.
�
− 33
! 34. π3, 2π3! 35. 2π
3, 4π3!
36. 3π4, 5π4
! 37. 5π6,11π6! 38. 7π
6,11π6! 39. 0, π ! 40. 3π
4, 7π4!
41. 3π4, 5π4! 42.
�
5π4, 7π4! 43. π ! 44. π
2,3π2! 45. π
2
46.
�
π3
+ 2π z, 2π3
+ 2π z ! 47.
�
5π6
+ 2π z , 7π6
+ 2π z ! 48.
�
5π6
+ π z! !
49.
�
0 + π z ! 50.
�
3π2
+ 2π z! 51.
�
π + 2π z!
52.
�
2π3
+ π z! ! 53.
�
2π3
+ 2πz , 4π3
+ 2π z ! 54.
�
5π4
+ 2π z , 7π4
+ 2π z
Answers to proofs will be covered in class.
4 – 51.
�
y = sin x( ) ! 2.
�
y = −2sin x( )
Critical Roots at x=
�
0 , π , 2π ! Roots at x =
�
0 , π , 2π
min/max of
�
± 1 at
�
π 2 , 3π 2 ! min/max of
�
± 2 at
�
π 2 , 3π 2
�
π
�
2πx
y1
–1! �
2π x
y2
–2�
π
Math 400 Chapter 1 Answers! Page 14 of 20 ! © 2018 Eitel
3.
�
y = 2sin x − π4
⎛ ⎝ ⎜
⎞ ⎠ ⎟ ! 4.
�
y = 3sin x + π2
⎛ ⎝ ⎜
⎞ ⎠ ⎟
!
�
9π4
y
x
2
–2
�
π4
�
5π4
!�
−π2
y
�
3π2
�
π2
x
3
–3
5.
�
y = 4sin x2
⎛ ⎝ ⎜
⎞ ⎠ ⎟ ! 6.
�
y = 3sin 2x( )
�
2π
�
4πx
y4
–4! !
�
π2�
πx
y3
–3
7.
�
y =12csc x( )! ! 8.
�
y = −2csc x( )
Vertical Asymptotes at
�
0 , π , 2π !
min/max of
�
± 1 /2 at
�
π 2 , 3π 2 !
�
π
�
2π
x
y
1/ 2
–1/ 2
!
�
π
�
2π
x
y
2
–2
Math 400 Chapter 1 Answers! Page 15 of 20 ! © 2018 Eitel
9.
�
y = 3csc x +3π2
⎛ ⎝
⎞ ⎠ ! 10.
�
y =csc x − π2
⎛ ⎝
⎞ ⎠
�
π2
x
y
3
–3
�
−3π2
�
−π2 !
�
π2
�
3π2
x
y
1
–1
�
5π2
11.
�
y = csc x3
⎛ ⎝
⎞ ⎠ ! 12.
�
y = csc 2θ3
⎛ ⎝
⎞ ⎠
�
π3
�
2π3
x
y
1
–1
!
�
3π2
�
6π2
x
y
1
–1
13.
�
y = cos x( ) ! ! 14.
�
y = −3cos x( )
Critical Roots at x=
�
−π 2 , π 2 , 3π 2
Amplitude =
�
± 1
min/max of
�
± 1 at
�
0 , π
�
π2
�
3π2
�
−π2
x
y1
–1! !
�
π2
�
3π2
�
−π2
x
y3
–3
Math 400 Chapter 1 Answers! Page 16 of 20 ! © 2018 Eitel
15.
�
y = 2cos x +π2
⎛ ⎝
⎞ ⎠ ! 16.
�
y = cos x( ) +1
�
π
�
−π x
y2
–2!
�
π2
�
3π2
�
−π2
x
y2
�
π
17.
�
y = 2cos x4
⎛ ⎝ ⎜
⎞ ⎠ ⎟ ! 18.
�
y = 3cos 2x( )
�
2π
�
8π
�
−2πx
y2
–2!
�
π4
�
3π4
�
−π4
x
y3
–3
19.
�
y = 2sec x( )! ! 20.
�
y = −3sec x( )
Asymptotes at x =
�
−π 2 , π 2 , 3π 2
min/max of
�
± 2 at x =
�
0 , π
�
π2
�
3π2
�
−π2
x
y
2
–2
!
�
π2
�
3π2
�
−π2
x
y
3
–3
Math 400 Chapter 1 Answers! Page 17 of 20 ! © 2018 Eitel
21.
�
y = 2sec x + π( )! ! 22.
�
y = sec x −π( )
x
y
2
–2
�
π2
�
−3π2
�
−π2 !
�
π2
�
3π2
x
y
1
–1
�
5π2
23.
�
y = sec x2
⎛ ⎝
⎞ ⎠ ! ! 24.
�
y =− sec 2x( )
�
π
�
3π
�
−π
x
y
2
–2
!
�
π4
�
3π4
�
−π4
x
y
1
–1
25.
�
y = 2tan x( )! ! 26.
�
y = 4 tan −x( )
Vertical Asymptotes at x =
�
−π 2 , π 2 !
Critical Root at x = 0no max or min values!
�
π2
�
−π2
x
y
!
�
π2
�
−π2
y
x
Math 400 Chapter 1 Answers! Page 18 of 20 ! © 2018 Eitel
27.
�
y = 2tan x − 2π( ) ! ! 28.
�
y = 4 tan x( ) + 3
�
5π2
y
�
3π2
x
! !
�
π2
�
−π2
x
y
3
29.
�
y = 5tan x8
⎛ ⎝
⎞ ⎠ ! ! 30.
�
y = 2tan 3x( )
�
4π
�
−4π
x
y
!
�
−π6
x
y
�
π6
31.
�
y = 2cot x( )! ! 32.
�
y = −3cot x( )Vertical Asymptotes at x =
�
0 , π Critical Root at x =
�
π 2
no max or min
�
π
�
π2
x
y
! `
�
π
y
x
�
π2
33.
�
y = 2cot x + π( )! 34.
�
y = 3cot x − π2
⎛ ⎝
⎞ ⎠
Math 400 Chapter 1 Answers! Page 19 of 20 ! © 2018 Eitel