Given the matrices A=[1−14−1] and B=[1−12−2]. The two matrices X and Y are such that X=BA−1 and Y=A−1B, then the matrix 3(X+Y) is:

Given the matrices A=[1−14−1] and B=[1−12−2]. The two matric

1.	Given the matrices A=[1−14−1] and B=[1−12−2]. The two matrices X and Y are such that X=BA−1 and Y=A−1B, then the matrix 3(X+Y) is:
Answer» Given the matrices $A = [\begin{matrix} 1 & - 1 4 & - 1 \end{matrix}]$ and $B = [\begin{matrix} 1 & - 1 2 & - 2 \end{matrix}]$ . The two matrices $X$ and $Y$ are such that $X = B A^{- 1}$ and $Y = A^{- 1} B,$ then the matrix $3 (X + Y)$ is: