Question

A matrix a of order 3 × 3 has determinant 5. What is the value of | 3a | ?

Answer 1

${\red{\huge{\mathfrak{Hello}}}}}$

|3A|= 3^(3) |A|

=27x5=135

in general, for a matrix of order nxn, |kA|= k^(n) |A|