Question

If A and B are square matrices of order 3 such that det A = -1, det B = 3, then det 3AB=
(a) -9 (b) -81
(c) -27 (d) 81


PLEASE EXPLAIN UR ANSWER.......

Answer 1

Answer:

Step-by-step explanation:

A=-1. B=3

=3×(-1)×3

=9×(-1)

=(-9)=-9

Answer 2

$given \\ |a| = - 1 \\ |b| = 3 \\ |3ab| = {3}^{(3 - 1)} |a| |b| \\ |3ab| = 9 |a| |b| \\ |3ab| = 9( - 1)(3) \\ = > |3ab| = - 27$
Hope it helps