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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = (5/2)*x+3 // - (5/2)*x+3
4/x-((5/2)*x)-3 = 0
(-5/2)*x+4/x-3 = 0
4*x^-1-5/2*x^1-3*x^0 = 0
(4*x^0-5/2*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-5/2*x^2-3*x^1) = 0
x^1
(-5/2)*x^2-3*x+4 = 0
(-5/2)*x^2-3*x+4 = 0
DELTA = (-3)^2-(4*4*(-5/2))
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(2*(-5/2)) or x = (3-49^(1/2))/(2*(-5/2))
x = -2 or x = 4/5
x in { -2, 4/5}
x in { -2, 4/5 }
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