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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = (5/4)*x+3 // - (5/4)*x+3
2/x-((5/4)*x)-3 = 0
(-5/4)*x+2/x-3 = 0
2*x^-1-5/4*x^1-3*x^0 = 0
(2*x^0-5/4*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-5/4*x^2-3*x^1) = 0
x^1
(-5/4)*x^2-3*x+2 = 0
(-5/4)*x^2-3*x+2 = 0
DELTA = (-3)^2-(2*4*(-5/4))
DELTA = 19
DELTA > 0
x = (19^(1/2)+3)/(2*(-5/4)) or x = (3-19^(1/2))/(2*(-5/4))
x = -2/5*(19^(1/2)+3) or x = -2/5*(3-19^(1/2))
x in { -2/5*(19^(1/2)+3), -2/5*(3-19^(1/2))}
x in { -2/5*(19^(1/2)+3), -2/5*(3-19^(1/2)) }
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