Question

Which expression gives the determinant of the matrix?
@vocaloid

Answer 1

I can’t really format this on mobile but you would first look at that first number in the matrix (1) and cross out every number in the same row and column as 1, then multiple by the determinant of what’s left

Answer 2

Then you would repeat the process with 4 and -2

There’s another catch about the signs though, it alternates from + to - across the row so 4 becomes -4

Answer 3

Anyway I gotta go to class but you can always use a calculator to check your solution >>