Q. 395.0( 2 Votes )

Find the value of

Answer :

We know, is identity matrix of size 3.


So according to the given criteria



Now we will multiply the two matrices on LHS using the formula cij = ai1b1j + ai2b2j + … + ainbnj, we get




And to satisfy the above condition of equality, the corresponding entries of the matrices should be equal


So we get


So the value of x is


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