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Find the integral value of x , if |[...

Find the integral value of `x` , if `|[x^2,x,1],[ 0, 2, 1],[ 3, 1, 4]|=28` .

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The correct Answer is:
`x=2`
$$ |\mathrm{A}|=\left|\begin{array}{lll} x^{2} & x & 1 \\ 0 & 2 & 1 \\ 3 & 1 & 4 \end{array}\right| $$ Expanding along the first row, ...
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