Help me with a shortcut method of finding matrices using inverse method​

There is no manual shortcut except you're using a program like MATLAB or Mathcad.

Otherwise the process still remains the same:

1. Find the determinant |a|

2. Find the minor, then find the cofactors C

3. Find the adjoint of a which is the transpose of C

4. Find the inverse with

2

explanation:

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answer a.