Matrix Division Calculator

The calculator will find the quotient of two matrices (if possible), with steps shown. It divides matrices of any size up to 7x7 (2x2, 3x3, 4x4, etc.).

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Calculate $\frac{\left[\begin{array}{ccc}4 & 5 & 7\\2 & 1 & 0\\1 & 2 & 3\end{array}\right]}{\left[\begin{array}{ccc}1 & 1 & 1\\2 & 3 & 4\\3 & 1 & 1\end{array}\right]}.$

Solution

By definition, $\frac{A}{B}=A\cdot B^{-1}$.

So, first find the inverse of $\left[\begin{array}{ccc}1 & 1 & 1\\2 & 3 & 4\\3 & 1 & 1\end{array}\right]$.

$\left[\begin{array}{ccc}1 & 1 & 1\\2 & 3 & 4\\3 & 1 & 1\end{array}\right]^{-1} = \left[\begin{array}{ccc}- \frac{1}{2} & 0 & \frac{1}{2}\\5 & -1 & -1\\- \frac{7}{2} & 1 & \frac{1}{2}\end{array}\right]$ (for steps, see inverse matrix calculator).

Finally, multiply the matrices: $\left[\begin{array}{ccc}4 & 5 & 7\\2 & 1 & 0\\1 & 2 & 3\end{array}\right]\cdot \left[\begin{array}{ccc}- \frac{1}{2} & 0 & \frac{1}{2}\\5 & -1 & -1\\- \frac{7}{2} & 1 & \frac{1}{2}\end{array}\right] = \left[\begin{array}{ccc}- \frac{3}{2} & 2 & \frac{1}{2}\\4 & -1 & 0\\-1 & 1 & 0\end{array}\right]$ (for steps, see matrix multiplication calculator).

$\frac{\left[\begin{array}{ccc}4 & 5 & 7\\2 & 1 & 0\\1 & 2 & 3\end{array}\right]}{\left[\begin{array}{ccc}1 & 1 & 1\\2 & 3 & 4\\3 & 1 & 1\end{array}\right]} = \left[\begin{array}{ccc}- \frac{3}{2} & 2 & \frac{1}{2}\\4 & -1 & 0\\-1 & 1 & 0\end{array}\right] = \left[\begin{array}{ccc}-1.5 & 2 & 0.5\\4 & -1 & 0\\-1 & 1 & 0\end{array}\right]$A