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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+2 = (4/5)*x // - (4/5)*x
3/x-((4/5)*x)+2 = 0
(-4/5)*x+3/x+2 = 0
3*x^-1-4/5*x^1+2*x^0 = 0
(2*x^1-4/5*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-4/5*x^2+3*x^0) = 0
x^1
(-4/5)*x^2+2*x+3 = 0
(-4/5)*x^2+2*x+3 = 0
DELTA = 2^2-(3*4*(-4/5))
DELTA = 68/5
DELTA > 0
x = ((68/5)^(1/2)-2)/(2*(-4/5)) or x = (-(68/5)^(1/2)-2)/(2*(-4/5))
x = -5/8*((68/5)^(1/2)-2) or x = 5/8*((68/5)^(1/2)+2)
x in { -5/8*((68/5)^(1/2)-2), 5/8*((68/5)^(1/2)+2)}
x in { -5/8*((68/5)^(1/2)-2), 5/8*((68/5)^(1/2)+2) }
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