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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/x = (18/4)*x-4 // - (18/4)*x-4
36/x-((18/4)*x)+4 = 0
(-9/2)*x+36/x+4 = 0
36*x^-1-9/2*x^1+4*x^0 = 0
(4*x^1-9/2*x^2+36*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^1-9/2*x^2+36*x^0) = 0
x^1
(-9/2)*x^2+4*x+36 = 0
(-9/2)*x^2+4*x+36 = 0
DELTA = 4^2-(4*36*(-9/2))
DELTA = 664
DELTA > 0
x = (664^(1/2)-4)/(2*(-9/2)) or x = (-664^(1/2)-4)/(2*(-9/2))
x = (2*166^(1/2)-4)/(-9) or x = (-2*166^(1/2)-4)/(-9)
x in { (2*166^(1/2)-4)/(-9), (-2*166^(1/2)-4)/(-9)}
x in { (2*166^(1/2)-4)/(-9), (-2*166^(1/2)-4)/(-9) }
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