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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x-(x/18) = 0
8*x^-1-1/18*x^1 = 0
(8*x^0-1/18*x^2)/(x^1) = 0 // * x^2
x^1*(8*x^0-1/18*x^2) = 0
x^1
(-1/18)*x^2+8 = 0
(-1/18)*x^2+8 = 0
DELTA = 0^2-(4*8*(-1/18))
DELTA = 16/9
DELTA > 0
x = ((16/9)^(1/2)+0)/(2*(-1/18)) or x = (0-(16/9)^(1/2))/(2*(-1/18))
x = -12 or x = 12
x in { -12, 12}
x in { -12, 12 }
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