Let C=[} 4&-6 5&-1 1&2 ] Find C+D C+D=square

To find the sum of two matrices, we simply add the corresponding elements in each matrix. <br /><br />So, let's add the corresponding elements in matrices C and D:<br /><br />$C+D=\begin{bmatrix} 4+(-1) & -6+2 \\ 5+2 & -1+5 \\ 1+1 & 2+6 \end{bmatrix}$<br /><br />Simplifying the above expression, we get:<br /><br />$C+D=\begin{bmatrix} 3 & -4 \\ 7 & 4 \\ 2 & 8 \end{bmatrix}$<br /><br />Therefore, the sum of matrices C and D is:<br /><br />$C+D=\begin{bmatrix} 3 & -4 \\ 7 & 4 \\ 2 & 8 \end{bmatrix}$