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EXAMPLE 2
Evaluating Determinants
(a)
|
2
3
−
1
2
|
=
(
2
)
(
2
)
−
(
−
1
)
(
3
)
=
4
+
3
=
7
(b)
|
A
B
C
2
3
1
−
1
2
−
1
|
=
|
3
1
2
−
1
|
A
−
|
2
1
−
1
−
1
|
B
+
|
2
3
−
1
2
|
C
=
(
−
3
−
2
)
A
−
(
−
2
+
1
)
B
+
(
4
+
3
)
C
=
−
5
A
+
B
+
7
C
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