Download Section 8-4 Answers

2
2
27. (3a + 7b)(3a − 7b)
ANSWER: 8-4 Special Products
4
9a − 49b
21. GENETICS The ability to roll your tongue is
inherited genetically from parents if either parent has
the dominant trait T. Children of two parents without
the trait will not be able to roll their tongues.
2
2
28. (5y + 7)
ANSWER: 2
25y + 70y + 49
2
29. (8 − 10a)
ANSWER: a. Show how the combinations can be modeled by
the square of a sum.
b. Predict the percent of children that will have both
dominant genes, one dominant gene, and both
recessive genes.
2
64 − 160a + 100a
30. (10x − 2)(10x + 2)
ANSWER: 2
100x − 4
ANSWER: 2
a. (0.5T + 0.5t)(0.5T + 0.5t) = 0.25T + 0.5Tt +
2
0.25t
b. TT: 25%; Tt: 50%; tt: 25%
Find each product.
22. (u + 3)(u − 3)
ANSWER: 31. (3t + 12)(3t − 12)
ANSWER: 2
9t − 144
32. (a + 4b)
2
ANSWER: 2
a + 8ab + 16b
2
2
u −9
33. (3q − 5r)
23. (b + 7)(b − 7)
2
ANSWER: 2
ANSWER: 9q − 30qr + 25r
2
2
b − 49
2
34. (2c − 9d)
24. (2 + x)(2 − x)
ANSWER: ANSWER: 4−x
2
4c − 36cd + 81d
2
35. (g + 5h)
25. (4 − x)(4 + x)
2
g + 10gh + 25h
2
26. (2q + 5r)(2q − 5r)
4q − 25r
36. (6y − 13)(6y + 13)
2
36y − 169
2
4
2
2
27. (3a + 7b)(3a − 7b)
ANSWER: 4
9a − 49b
2
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28. (5y +Manual
ANSWER: 2
4
37. (3a − b)(3a + b)
ANSWER: 8
9a − b
2
2
2
ANSWER: ANSWER: 2
2
ANSWER: ANSWER: 16 − x
2
2
2 2
38. (5x − y )
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ANSWER: 4
2 2
25x − 10x y + y
4
4
4
37. (3a − b)(3a + b)
ANSWER: 8-4 Special Products
8
2
9a − b
2
2 2
38. (5x − y )
ANSWER: 4
2 2
25x − 10x y + y
2
3
2
4
3
39. (8a − 9b )(8a + 9b )
ANSWER: 4
64a − 81b
6
GEOMETRY Find the area of each shaded region.
47. ANSWER: 6x + 3
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