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 ⎦ ⎥ ⎥ ⎤