Question

find the inverse af of the matrix
[1 2 3
1 1 5
2 4 7]
by using elementry row
transformations.​

Answer 1

Step-by-step explanation:

Answer

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⎣⎢⎢⎡12−225−4375⎦⎥⎥⎤

⎣⎢⎢⎡12−225−4375∣∣∣100010001⎦⎥⎥⎤

eliminate first column

⎣⎢⎢⎡1002103111∣∣∣1−22010001⎦⎥⎥⎤

eliminate second column

⎣⎢⎢⎡100