Question

I need help with solving this. I'm really struggling with understanding matrices.

What is the solution for the determinant?

1 7

0 -3

(Those numbers are in brackets)

Thank you to anyone who can explain this to me! I don't want to be given the answer, I actually want to learn how to do this. I have several more problems like this one to solve.

Answer 1

a 2x2 matrix has a simple shortcut for a determinant

a b
c d

det = ad - bc