1. Quadratic Functions pages 520–523 Exercises 1. x = 0, (0, 4)
ALGEBRA 1 LESSON 10-2
pages 520–523  Exercises
1. x = 0, (0, 4)
2. x = –1, (–1, –7)
3. x = 4, (4, –25)
4. x = 1.5, (1.5, –1.75)
5. B
6. E
7. C
8. F
9. A
10. D
11.
12.
13.
14.
15. a. 20 ft
b. 400 ft2
16. a s
b. 31 ft
17.
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2. Quadratic Functions
ALGEBRA 1 LESSON 10-2
18.
19.
20.
21.
22.
23.
24.
25.
26.
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3. Quadratic Functions 27. 28. 29. 30. 31. 32–34. Answers may vary.
ALGEBRA 1 LESSON 10-2
27.
28.
29.
30.
31.
32–34. Answers may vary.
Samples are given.
32. y = 2x2 – 8x + 1
33. y = –3x2
34. y = 2x2 + 4
35. a. 1.2 m
b. 7.2 m
36. a. y < –0.1x2 + 12 b.
c. Yes; when x = 6, y = 8.4,
so the camper will fit.
37. a. $12.50
b. $10,000
units2
units2
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4. 40. Answers may vary. Sample: If the coefficient of the squared
Quadratic Functions
ALGEBRA 1 LESSON 10-2
40. Answers may vary. Sample: If
the coefficient of the squared
term is pos., the vertex point is
a min.; if it is neg., the vertex
point is a max.
41. Answers may vary. Sample: a
affects whether the parabola
opens up or down, b affects
the axis of symmetry, and c
affects the y-intercept.
42. a. w = 13 –
b. A = –
c. (6.5, 42.25)
d. 6.5 ft by 6.5 ft
43. a. 0.4 s
b. No; after 0.6 s, the ball will
have a height of about 2.23 m
but the net has a height of 2.43 m.
44.
45. a. 0.4 s
b. No; it takes about 0.8 s to return to
h = 0.5 m, so it will take more time
to reach the ground.
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5. [1] appropriate methods, but with a minor computational error 51. C
Quadratic Functions
ALGEBRA 1 LESSON 10-2
46. a. (0, 2)
b. x = –2.5
c. 5
d. y = x2 + 5x + 2
e. Answers may vary.
Sample: Test (–4, –2).
–2 (–4)2 + 5(–4) + 2
– –
–2 = –2
f. No; you would not be
able to determine the
b value using the
vertex formula.
47. A
48. I
49. B
50. [2] axis of symmetry:
x = =
maximum height:
y –0.009(16.7) (16.7) + 4.5
y ft
[1] appropriate methods, but with a minor computational error
51. C
52. A
53. F
54. D
55. B
56. E –b 2a
–0.3
2(–0.009)
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6. Quadratic Functions 57. c2 – 5c – 36 58. 2x2 + 7x – 30
ALGEBRA 1 LESSON 10-2
57. c2 – 5c – 36
58. 2x2 + 7x – 30
59. 20t t + 3
60. 21n4 – 62n2 + 16
61. 2a3 + 9a2 – a + 20
62. 6r 3 + 9r 2 – 20r + 7
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