1. The problem statement, all variables and given/known data If A is a square matrix of order 3 then the true statement is 1. det(-A) = - det A 2.det A = 0 3.det ( A + I) = I + detA 4.det(2A) = 2detA 2. Relevant equations NA 3. The attempt at a solution 2. option is obviously not true. Making a random matrix A and verifying properties 1. , 3. , 4. would be lengthy. What is the approach for this?