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Questions  >>  CBSE XII  >>  Math  >>  Determinants
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$If \; A^{-1}=\begin{bmatrix} 3 &-1 & 1\\ -15&6 &-5 \\ 5& -2&2 \end{bmatrix} \; and \; B = \begin{bmatrix} 1 & 2 & -2\\ -1 & 3 & 0\\ 0 & -2 & 1 \end{bmatrix}, \; find \; (AB)^{-1} $

$\begin{array}{1 1} (AB)^{-1}=\begin{bmatrix}9 & -2 & 5\\-2 & -1 & 0\\1 & 0 & 2\end{bmatrix} \\(AB)^{-1}=\begin{bmatrix}9 & -3 & 5\\-2 & 1 & 0\\1 & 0 & 2\end{bmatrix} \\ (AB)^{-1}=\begin{bmatrix}-9 & -3 & 5\\-2 & 1 & 0\\-1 & 0 & 2\end{bmatrix} \\ (AB)^{-1}=\begin{bmatrix}9 & -3 & 5\\-2 & 1 & 1\\1 & 1 & 2\end{bmatrix} \end{array} $

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