Question
Question: If A and B are square Matrices of order 3 such that \|A\| = –1 , \|B\| = 3 then \|3AB\| = ---------...
If A and B are square Matrices of order 3 such that |A| = –1 , |B| = 3 then |3AB| = ---------
A
–9
B
–81
C
–27
D
81
Answer
–81
Explanation
Solution
|3AB| = 3 × 3 × 3 |A| |B| = 27 (–1) (3) = –81