Find the inverse of {(4, -1), (3, -2), (6, 9), (8, 5)}.
1 answer:
Answer:
A∣=3(8−7)+1(−2−4)=3−6=−3
co-factor matrix =
⎣
⎢
⎢
⎡
−1
5
3
−4
23
−11
1
−11
−6
⎦
⎥
⎥
⎤
Adj.A=
⎣
⎢
⎢
⎡
−1
−4
1
5
23
−11
3
12
−6
⎦
⎥
⎥
⎤
A
−1
=
∣A∣
1
Adj.A=
3
−1
⎣
⎢
⎢
⎡
−1
−4
1
5
23
−11
3
12
−6
⎦
⎥
⎥
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