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