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Given: I is identity matrix so To show that Now, we will find the matrix for A2, we get  [as cij = ai1b1j + ai2b2j + … + ainbnj]  Now, we will find the matrix for 5A, we get   So, Substitute corresponding values from eqn(i) and (ii), we get  [as rij = aij + bij + cij] Therefore, Hence proved

We will find A4 Multiply both sides by A2, we get    As multiplying by the identity matrix, I don’t change anything. Now will substitute the corresponding values we get        Hence this is the value of A4

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