Question

Hlw guys..! Ans this attachment...... ​

Answer 1

Solution----->

1) First we find value of AB by multiplying A and B First we take first row of A and take first column of B and multiplying first term by first term and second term by second term and putting positive sign between them by this we get first term or AB₁₁ of AB

2) Then we multiply first row of A by second column of of B by same process we get AB₁₂ of AB

3) Then we multiply second row of A to first and second column one by one to get AB₂₁ and AB₂₂

4) Now I is identity matrix of 2×2 order , we calculate 3I

5) Now we easily calculate AB - 3I , by subtracting corresponing elements , and get the answers