Question

If I is an identity matrix of order 2 and A is another matrix of order 2, then IA is (a) I (b) -A (c) A (d) None of the above options​. (Show solving steps)

Answer 1

Given,

If I is an identity matrix of order 2 and A is another matrix of order 2, then IA is (a) I

(b) -A

(c) A

(d) None of the above options​

Solution,

Formula based,$\[IA = A.\]$

Apply formula,

$\[ \Rightarrow IA = A\]$

Hence, the correct option is (c) i.e. A.