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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8*x = 112/x // - 112/x
8*x-(112/x) = 0
8*x-112*x^-1 = 0
8*x^1-112*x^-1 = 0
(8*x^2-112*x^0)/(x^1) = 0 // * x^2
x^1*(8*x^2-112*x^0) = 0
x^1
8*x^2-112 = 0
8*x^2-112 = 0
DELTA = 0^2-(-112*4*8)
DELTA = 3584
DELTA > 0
x = (3584^(1/2)+0)/(2*8) or x = (0-3584^(1/2))/(2*8)
x = 14^(1/2) or x = -14^(1/2)
x in { -14^(1/2), 14^(1/2)}
x in { -14^(1/2), 14^(1/2) }
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