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EXAMPLES
2 and 3
on pp. 188–189
for Exs. 18–23
3.6
EXAMPLES
2 and 4
on pp. 196–198
for Exs. 24–28
EXERCISES
Perform the indicated operation.
4 25 21 3
18. F 2 3G1F27 4G 21 8 7 24
19. F 2 23G 1F 6 21G
10 24 0 9
20. F 5 1G2F 2 7G 22 3 5 24 7 5
21. F21 6 22G 2F 28 0 29G
5 22
22. 23F
8 4 5
23.
3 6G 8F 21 6 22G
Multiply Matrices pp. 195–202
E XAMPLE
5F
2 23
5G 22 3
Find AB if A 21 0 and B 5F 3 1G.
4
5F
2 23
22 3
AB 21 0
3
4 5GF 1G 5F
2(22) 1 (23)(3) 2(3) 1 (23)(1)
21(22) 1 0(3) 21(3) 1 0(1)
4(22) 1 5(3) 4(3) 1 5(1)G
3
5F213
2 23
7 17G
EXERCISES
Find the product.
8 2
24. f21 21gF
26 29G
11 7 0 25
25. F 1 25GF 4 23G
4 21 5 22 4
26. F 1 7GF 3 12 6G 22 5 6 23 5
27. F 0 3GF 2 0 21G
28. MANUFACTURING A company manufactures three models of flat-screen
color TVs: a 19 inch model, a 27 inch model, and a 32 inch model. The TVs are
shipped to two warehouses. The number of units shipped to each warehouse
are given in matrix A, and the prices of the models are given in matrix B. Find
the total value of the TVs in each warehouse by model.
Matrix A Matrix B
19 in. 27 in.
Warehouse 1 5,000 6,000
Warehouse 2 F 4,000 10,000
32 in.
8,000
5,000G
Price
F 19 inch $109.99
27 inch $319.99
32 inch $549.99G
TEXAS
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Chapter Review Practice
Chapter Review 225