Given the matrices aa and bb shown below, find -a-\frac{1}{4}b.−a−
4
1

b.
a=\begin{bmatrix} 0 & 3 \\ 2 & -1 \\ 0 & 3 \\ -5 & -2\end{bmatrix}\,\,\,\,b=\begin{bma trix} -28 & 8 \\ -4 & -8 \\ 20 & 40 \\ 0 & 48\end{bmatrix}
a=
⎣
⎢
⎢
⎡


0
2
0
−5


3
−1
3
−2


⎦
⎥
⎥
⎤

b=
⎣
⎢
⎢
⎡


−28
−4
20
0


8
−8
40
48


⎦
⎥
⎥
⎤