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inverse (
4
7
10
19
20
−1
5
7
6
1
25
4
4
8
2
5
)
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Solution
(
−2288917
89117834
−1482
51517834
−82726751
−2248917
4723
396526751
−10926751
−1058917
32723
−9226751
6388917
448917
−6241
−5258917
)
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Solution steps
Solve by:
One step at a time
(
4
7
10
19
20
−1
5
7
6
1
25
4
4
8
2
5
)−1
Inverse matrix
A matrix is invertible if and only if there is a sequence of elementary row (or column) operations taking it to the identity matrix.
Augment with a 4x4identity matrix
[
4
7
10
19
∣
1
0
0
0
20
−1
5
7
∣
0
1
0
0
6
1
25
4
∣
0
0
1
0
4
8
2
5
∣
0
0
0
1
]
Reduce the matrix on the left to the identity matrix
[
1
0
0
0
∣
−2288917
89117834
−1482
51517834
0
1
0
0
∣
−82726751
−2248917
4723
396526751
0
0
1
0
∣
−10926751
−1058917
32723
−9226751
0
0
0
1
∣
6388917
448917
−6241
−5258917
]
The inverse matrix is on the right side of the augmented matrix