Use the inverse matrices to find $(AB{)}^{-1},(A^{TT}{)}^{-1},$ and $(2A{)}^{-1}.$

$A^{-1}=\left[\begin{array}{ccc}\frac{1}{4}& 1& -2\\ \frac{1}{2}& -\frac{1}{2}& \frac{3}{4}\\ 1& \frac{3}{2}& \frac{1}{2}\end{array}\right],B^{-1}=\left[\begin{array}{ccc}2& 2& \frac{1}{4}\\ -\frac{3}{4}& 4& 2\\ \frac{1}{2}& \frac{1}{4}& \frac{5}{2}\end{array}\right]$

$($a$)(AB{)}^{-1}$

$($b$)(A^T{)}^{-1}$

$($c$)(2A{)}^{-1}$

Need Help?