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