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21-09-2016
Mathematics

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find the value of this expression if x=4 x^2-4/x-8

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nobillionaireNobley nobillionaireNobley

22-09-2016

x = 4 + (x^2 - 4) / (x - 8)
x(x - 8) = 4(x - 8) + x^2 - 4
x^2 - 8x = 4x - 32 + x^2 - 4
-8x - 4x = -32 - 4
-12x = -36
x = -36/-12
x = 3

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