Question

Which matrix has determinant –7
(pics attached)

Answer 1

when u have:
a b
c d

the determinant is: a*d - b*c

Answer 2

whats abcd?

Answer 3

the matrix, so for example in the first one you would do:
2*7 - (-13)*3 to get the determinant

Answer 4

\[\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\]