Anyone know of a good way to find the answer to det[x+5 4 4],[-4 x-3 -4], [-4 -4 x-3] = 0

Anyone know of a good way to find the answer to det[x+5 4 4],[-4 x-3 -4], [-4 -4 x-3] = 0

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Read this, be happy: http://en.wikipedia.org/wiki/Rule_of_Sarrus

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