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Dimensions Mathematics Core Edition 8A Textbook
07/21/2014
Page Added (mm/dd/yyyy)
12 Try It 7 Evaluate the following.
16 Remarks Need to bold the s in “standard form” 07/28/2014
18 Diagram In the bar diagram for “The Scale of Things” 1,000,000 nanometers 1,000 nanometers
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20 Ex. 1.5 6(c) The cosmos contains approximately 50 billion galaxies.
35 Rev. Ex. 1 5(d) This question is not appropriate since it involves quadratics which is covered later. Change to
1 1
2 2
1
2 a aa
Solution is: 1 1 1 11 1 12 2 2 22 2 2
1
a a a a a
a
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40 Recall The distributive law is applied to… 07/28/2014
56 If we add the two respective quantities on each side, that is a + c and b + d, what can we say about their sums?
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67 Rev. Ex. 2 9 The perimeter of the framework is 192 cm. 07/28/2014
11(b) If the pair of equations has no unique solution, … 07/28/2014
81 Example 12(b) Solution
121p2 – 132pq +36q2 = (11p)2 – 2(11p)(6q) + (6q)2 = (11p – 6q)2
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87 This is an important property of the parabola … 07/28/2014
88 Now consider the reverse problem. If you are given the expression x2 + 3x + 2 and want to write in in …
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90 Example 2 The product pq is positive, so either both p and q have to … 07/28/2014
91 Example 3 When p = –1 and q = 7, –1 + 3(7) = 20 07/28/2014
97 It is necessary to check whether the solutions obtained from solving the quadratic equation satisfy the condition in the original problem.
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100 Ex 4.3 7 The sum of the squares of three consecutive positive odd numbers is 251.
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101 First bullet point: Change comma at the end to period. 07/28/2014
102 Rev. Ex. 6 9 The cost for paving the border of a square flower bed is $20 per meter.
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115 Top of page 32
22 2x
xx
x
127 Rev. Ex. 5 7 Make the letter in the parentheses the subject of each of the given formulas.
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2
132 Reflections The above pictures show the reflection of a child in a mirror, …
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152 Class Activity 5
(b) Plot … on another sheet of graph paper. 07/28/2014
171 Caption under second diagram: Vertex X is the center of enlargement.
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206 Try It 11 Find the measures of angles x and y. 07/28/2014
218 Example 20 Method 2 30° x n = 360° 07/28/2014
221 Top right box: Angle Properties of Triangles
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Answers
Page
226 Ex. 1.1 8 m = 3, n = 77; m = 7, n = 33; m = 11, n = 21
227 Ex. 1.5 5(e) 3 x 1010 08/19/2014
228 Ex. 1.7 3(d) 0.32 08/19/2014
229 Ch. 2 Try It 12 x = 422
23, y = 2
14
23
Ex. 2.1 13(a) 4x – 6y = 3,000
13(b) x = 400, y = 100; x = 1,200, y = 300
Ex 2.3 2(h) x = –12
3; y = –2
1
3
231 Ex. 3.3 6(d) (1 – 6xy)2
Review Exercise 3 08/19/2014
232 Ex. 4.2 4(b) –1
1
4 or 3
Ex. 4.3 10 8 m or 12 m 08/19/2014
235 Ex. 5.5 8(f) 42
2
9
4bn
S
a
235 Rev. Ex. 5 9 (a)
2
2
9
9cy
xy
(b) 7 , 2.65
237 Rev. Ex. 6 10 R(–1, 2), S(–1, 0), T(3, 0)
13(b) A2(5, –2), B2(13, 0), C2(11, 4), D2(7, 4)
13(c) An enlargement about center (–3, 4) with a scale factor of 2.
Dimensions Math Textbook 8A includes activities using The Geometer's Sketchpad, which is no longer available. We recommend using GoeGebra instead.
