Answer
$\left[\begin{array}{rr}
3 & -12\\
0 & 6\\
-12 & 36
\end{array}\right]$
Work Step by Step
$A=\left[\begin{array}{ll}
0 & -1\\
1 & 0\\
-1 & 2
\end{array}\right], \quad B=\left[\begin{array}{ll}
0.25 & -1\\
0 & 0.5\\
-1 & 3
\end{array}\right],\quad C=\left[\begin{array}{ll}
1 & -1\\
1 & 1\\
-1 & -1
\end{array}\right]$.
Scalar Multiplication$:\quad(cA)_{ij}=c(A_{ij})$
-------
$12B=\left[\begin{array}{ll}
12(0.25) & 12(-1)\\
12(0) & 12(0.5)\\
12(-1) & 12(3)
\end{array}\right]=\left[\begin{array}{ll}
3 & -12\\
0 & 6\\
-12 & 36
\end{array}\right]$
