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**Hint:**For a matrix to be skew symmetric the condition which is to be satisfied is $A = - {A^T}$.First find $-{A^T}$ and then equate it to the given condition and compare the elements in matrix both in L.H.S and R.H.S and determine the value of x.

**Complete step-by-step answer:**

We are given that $A = \left( {\begin{array}{*{20}{c}}

0&1&{ - 1} \\

{ - 1}&0&3 \\

x&{ - 3}&0

\end{array}} \right)$and we have to find the value of x for this matrix is skew symmetric.

For a matrix to be skew symmetric the condition which is to be satisfied is given as –

$A = - {A^T}$……. (1)

We will start by finding the value of ${A^T}$.

We find the transpose of a matrix is obtained by changing rows to columns and columns to rows. In other words, the transpose of a matrix is obtained by interchanging $A_{ij}$ to $A_{ji}$.

In simpler words Transpose of a Matrix is defined as “A Matrix which is formed by turning all the rows of a given matrix into columns and vice-versa.”

$A = \left( {\begin{array}{*{20}{c}}

0&1&{ - 1} \\

{ - 1}&0&3 \\

x&{ - 3}&0

\end{array}} \right)$

Changing rows in columns and columns into row we get the transpose as shown –

${A^T} = \left( {\begin{array}{*{20}{c}}

0&{ - 1}&x \\

1&0&{ - 3} \\

{ - 1}&3&0

\end{array}} \right)$

Multiplying both sides by -1 we get,

$ - {A^T} = ( - 1)\left( {\begin{array}{*{20}{c}}

0&{ - 1}&x \\

1&0&{ - 3} \\

{ - 1}&3&0

\end{array}} \right)$

To multiply -1 in a matrix we have to multiply -1 to every value inside the matrix by -1. Thus,

$ - {A^T} = \left( {\begin{array}{*{20}{c}}

0&1&{ - x} \\

{ - 1}&0&3 \\

1&{ - 3}&0

\end{array}} \right)$…………. (2)

Substituting matrix $A$ and equation (2) in equation (1), we get

$A = - {A^T}$

$\left( {\begin{array}{*{20}{c}}

0&1&{ - 1} \\

{ - 1}&0&3 \\

x&{ - 3}&0

\end{array}} \right) = \left( {\begin{array}{*{20}{c}}

0&1&{ - x} \\

{ - 1}&0&3 \\

1&{ - 3}&0

\end{array}} \right)$

Now we have to equate the matrix $A$ and $ - {A^T}$. While equating the matrices we have to equate every element in a row of a column with corresponding value of the other matrix.

Equating ${a_{13}}$ we get,

\[ - 1 = - x\]

Which implies, \[x = 1\]

Similarly, equating ${a_{31}}$ we get,

x = 1

Therefore, for x=1 the matrix $A$ is skew symmetric.

**Note:**While multiplying any constant to a matrix we have multiplied this constant to every element of the matrix.Students should remember for a matrix to be skew symmetric the condition which is to be satisfied is $A = - {A^T}$ and for a matrix to be symmetric the condition which is to be satisfied is$A = {A^T}$.

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