Question

If A is a square matrix such that |A|=5 write the value of |AAT|​

Answer 1

Answer:

T is a unit matrix

By property we know,

|AAT|=|A|×|A|×|T|=5×5×1=25

Answer 2

Answer:

Solution :

|AT|=5

(A=AT)

∴|AAT|=5×5

=25