Question

math help

Answer 1

How do i go about this?

Answer 2

\[A=\left[\begin{matrix}-1 & 2\\ 0 & 4\\6 &3\\-3&-4\end{matrix}\right]\]
2R2-R4 gives
\[A=\left[\begin{matrix}-1 & 2\\ 2(0)-(-3)& 2(4)-(-4)\\6&3\\-3&-4\end{matrix}\right]\]
\[A=\left[\begin{matrix}-1 & 2 \\ 3& 12\\6&3\\-3&-4\end{matrix}\right]\]

Answer 3

you messed up

Answer 4

the bottom two are positive