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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/8 = 6/x // - 6/x
(3*x)/8-(6/x) = 0
(3*x)/8-6*x^-1 = 0
3/8*x^1-6*x^-1 = 0
(3/8*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(3/8*x^2-6*x^0) = 0
x^1
(3/8)*x^2-6 = 0
(3/8)*x^2-6 = 0
DELTA = 0^2-(-6*4*(3/8))
DELTA = 9
DELTA > 0
x = (9^(1/2)+0)/(2*(3/8)) or x = (0-9^(1/2))/(2*(3/8))
x = 4 or x = -4
x in { -4, 4}
x in { -4, 4 }
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