What are you having problems with? the matrix product? showing that the
determinant of the product is the product of the determinants? or the last
part?
if det(AB)=det(A)det(B), and A is singular, then det(A)=0, so det(AB)=0
and so AB is simgular.
Yes i know how to do part A the muliplication but its the next to parts? i dont understand det? an the concept of singular and non singular?
Many thanks my friend
Yes i know how to do part A the muliplication but its the next to parts? i dont understand det? an the concept of singular and non singular?
Many thanks my friend
The determinant of a 2 x 2 matrix is
$\displaystyle \left | \begin{matrix} a & b \\c & d \end{matrix} \right | = a \cdot d - b \cdot c$
A singular matrix is a matrix with a 0 determinant. A non-singular matrix is a matrix with a non-zero determinant.