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6A
a 2×2
b 2×1
c 2×3
d 1×3
e 1×2
f 3×3

6A


6A


Example 5


6B
a 1×2
b 3×3
c 1×2
d 2×2
e 2×3
f 3×2

6B
a = 3, b = -2

Example 9
7

Example 13
a 2k2 + 19k + 9
b k = -1/2 and -9

Example 15
PQ(PQ)-1 = I
P-1PQ(PQ)-1 = P-1
IQ(PQ)-1 = P-1
Q(PQ)-1 = P-1
Q-1Q(PQ)-1 = Q-1P-1
I(PQ)-1 = Q-1P-1
(PQ)-1 = Q-1P-1 as required

6C


Example 17


Example 19
