$A$ is a square matrix of order 3 with $|A| = 5$. What is $|2A|$?

Explanation

1. 01

   $2A$ multiplies each of the 3 rows of $A$ by $2$, and each row brings out one factor $2$.

2. 02

   $|2A| = 2^{3}|A| = 8 \times 5 = 40$.