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  • If <img alt="\begin{vmatrix} 2x & -9\\ -2 &x \end{vmatrix} = \begin{vmatrix} -4 &8 \\ 1 &-2 \end{vmatrix}" src="https://learn.careers360.com/latex-image/?%5Cbegin%7Bvmatrix%7D%202x%20%26%20-9%5C%5C%20-2%20%26x%20%5Cend%7Bvmatrix%7D%20%3

If \begin{vmatrix} 2x & -9\\ -2 &x \end{vmatrix} = \begin{vmatrix} -4 &8 \\ 1 &-2 \end{vmatrix} , then value of x is ____________ .

 

 

 

Answers (1)

\begin{vmatrix} 2x & -9\\ -2 &x \end{vmatrix} = \begin{vmatrix} -4 &8 \\ 1 &-2 \end{vmatrix}

\\ 2x(x)-18 = 8 -8 = 0 \\ x^2 = 9 \\ x = \pm 3

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Safeer PP

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