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Find the value of x, from the following:...

Find the value of x, from the following: `|(x,4),(2,2x)|=0`

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`|[x,4],[2,2x]| = 0`
Expanding the determinant,
`x(2x)-4(2) = 0`
`=>2x^2-8 = 0`
`=>2x^2 = 8`
`=>x^2 = 4`
`=>x = 2 or x = -2`
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