NCERT Class 12-Mathematics: Exemplar Chapter –3 Matrices Part 8

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Question 15:

If possible, find and , where

Answer:

We have,

So, AB and BA both are possible

[Since, in both A.B and B. A, the number of columns of first is equal to the number of rows of second.]

And

Question 16:

Show by an example that for .

Answer:

Let

Hence proved.

Question 17:

Given

Answer:

We have,

And

Also,

Thus, we see that,

Question 18:

Solve for x and y:

Answer:

We have,

And

On subtracting Eq. (i) and from (ii), we get

Question 19:

If X and Y are matrices, then solve the following matrix equations for X and Y

Answer:

We have,

And

On subtracting Eq. (i) from Eq. (ii), we get

On adding Eq. (i) and (ii), we get

From Eq.(iv),

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