The given matrix equation is :

The first matrix is an identity matrix which is denoted by I .

Let P = and B =

Thus the equation becomes

IP = B

As we know that any matrix when multiplied with the identity matrix will be the matrix itself. But here the order of I is 3while the order of P is 3, so the order of the result matrix is 3

IP = P =

So, we have

P = B

On comparing both sides we get,