question_answer

Find

Answer:

Given, Since,  is a \[3\times 1\] matrix and  matrix. Therefore, order of matrix A is \[1\times 3\] matrix.             So, let \[A=[\begin{matrix}    x & y & z  \\ \end{matrix}]\]  Now, we have             \[\Rightarrow \]   On equating the corresponding elements, we get             \[x=-1,\] y = 2 and z = 1 Hence, \[A=[\begin{matrix}    -\,1 & 2 & 1  \\ \end{matrix}]\]