Solve a matrix equation
Let \(Q\) be the unknown 2 × 2 matrix
Use the displayed row and column positions for every matrix. All entries are exact
\[Q + L = K\]
\[L = \begin{bmatrix} 3 & 1 \\ 5 & 5 \end{bmatrix}\]
\[K = \begin{bmatrix} 4 & -7 \\ 6 & 9 \end{bmatrix}\]