Question

Please help me step by step!!! ASAP!!!!!
2. evaluate the determinant of the matrix
{-4 5 6]
[0 4 4]
[-2 -5 4]

Answer 1

\[-4\left[\begin{matrix}4 & 4 \\ -5 & 4\end{matrix}\right]-5\left[\begin{matrix}0 & 4 \\ -2 & 4\end{matrix}\right]+6\left[\begin{matrix}0 & 4 \\ -2 & -5\end{matrix}\right]\]

Answer 2

okay so wait the first one you multiply all of it by -4 right ??

Answer 3

yes, and where did come from that -4

Answer 4

i do the shortcut ofr a 3x3 ...