Let A = [a_{ij}] be a 3 times 3 matrix such t | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Let $A = \begin{bmatrix} a_{11} & a_{12} & a_{13} \ a_{21} & a_{22} & a_{23} \ a_{31} & a_{32} & a_{33} \end{bmatrix}$.From $A \begin{bmatrix} 0

Vedclass · Accepted Answer

$-1$

Vedclass · Answer

(A) Let $A = \begin{bmatrix} a_{11} & a_{12} & a_{13} \ a_{21} & a_{22} & a_{23} \ a_{31} & a_{32} & a_{33} \end{bmatrix}$.From $A \begin{bmatrix} 0 \ 1 \ 0 \end{bmatrix} = \begin{bmatrix} 0 \ 0 \ 1 \end{bmatrix}$,we get the second column of $A$ as $\begin{bmatrix} a_{12} \ a_{22} \ a_{32} \end{bmatrix} = \begin{bmatrix} 0 \ 0 \ 1 \end{bmatrix}$. Thus,$a_{12} = 0, a_{22} = 0, a_{32} = 1$.From $A \begin{bmatrix} 4 \ 1 \ 3 \end{bmatrix} = \begin{bmatrix} 0 \ 1 \ 0 \end{bmatrix}$,the second row equation is $4a_{21} + a_{22} + 3a_{23} = 1$. Since $a_{22} = 0$,we have $4a_{21} + 3a_{23} = 1$ (Equation $1$).From $A \begin{bmatrix} 2 \ 1 \ 2 \end{bmatrix} = \begin{bmatrix} 1 \ 0 \ 0 \end{bmatrix}$,the second row equation is $2a_{21} + a_{22} + 2a_{23} = 0$. Since $a_{22} = 0$,we have $2a_{21} + 2a_{23} = 0$,which implies $a_{21} = -a_{23}$ (Equation $2$).Substituting Equation $2$ into Equation $1$: $4(-a_{23}) + 3a_{23} = 1 \Rightarrow -4a_{23} + 3a_{23} = 1 \Rightarrow -a_{23} = 1 \Rightarrow a_{23} = -1$.

Similar Questions

If $A=\left[\begin{array}{rr}i & -i \\ -i & i\end{array}\right]$ and $B=\left[\begin{array}{rr}1 & -1 \\ -1 & 1\end{array}\right]$, then find $A^8$. (in $B$)

For what values of $x$: $\left[\begin{array}{lll}1 & 2 & 1\end{array}\right]\left[\begin{array}{lll}1 & 2 & 0 \\ 2 & 0 & 1 \\ 1 & 0 & 2\end{array}\right]\left[\begin{array}{l}0 \\ 2 \\ x\end{array}\right]=O$?

$A = [a_{ij}]_{m \times n}$ is a square matrix,if

The matrix $A^2 + 4A - 5I$,where $I$ is the identity matrix and $A = \begin{bmatrix} 1 & 2 \\ 4 & -3 \end{bmatrix}$,equals:

If $A = \begin{bmatrix} 3 & 4 \\ 1 & -6 \end{bmatrix}$ and $B = \begin{bmatrix} -2 & 5 \\ 6 & 1 \end{bmatrix}$,then find $X$ such that $A + 2X = B$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module