How do you invert a 2x2 matrix?
- 913 views
Take a matrix A=(acbd), where a,b,c,d are numbers.
First find the determinant. This is a*d-b*c.
Now, rearrange the matrix to become (d-c-ba). Divide this by the determinant, to have A-1=1/(ad-bc)(d-c-ba). This is the inverse of A.
