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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/4)*x-(5/16) = 4/x // - 4/x
(6/4)*x-(4/x)-(5/16) = 0
(6/4)*x-4*x^-1-5/16 = 0
3/2*x^1-4*x^-1-5/16*x^0 = 0
(3/2*x^2-5/16*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(3/2*x^2-5/16*x^1-4*x^0) = 0
x^1
(3/2)*x^2+(-5/16)*x-4 = 0
(3/2)*x^2+(-5/16)*x-4 = 0
DELTA = (-5/16)^2-(-4*4*(3/2))
DELTA = 6169/256
DELTA > 0
x = ((6169/256)^(1/2)-(-5/16))/(2*(3/2)) or x = (-(-5/16)-(6169/256)^(1/2))/(2*(3/2))
x = ((6169/256)^(1/2)+5/16)/3 or x = (5/16-(6169/256)^(1/2))/3
x in { (5/16-(6169/256)^(1/2))/3, ((6169/256)^(1/2)+5/16)/3}
x in { (5/16-(6169/256)^(1/2))/3, ((6169/256)^(1/2)+5/16)/3 }
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