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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x-((9/4)*x) = 12 // - 12
11/x-((9/4)*x)-12 = 0
(-9/4)*x+11/x-12 = 0
11*x^-1-9/4*x^1-12*x^0 = 0
(11*x^0-9/4*x^2-12*x^1)/(x^1) = 0 // * x^2
x^1*(11*x^0-9/4*x^2-12*x^1) = 0
x^1
(-9/4)*x^2-12*x+11 = 0
(-9/4)*x^2-12*x+11 = 0
DELTA = (-12)^2-(4*11*(-9/4))
DELTA = 243
DELTA > 0
x = (243^(1/2)+12)/(2*(-9/4)) or x = (12-243^(1/2))/(2*(-9/4))
x = -2/9*(9*3^(1/2)+12) or x = -2/9*(12-9*3^(1/2))
x in { -2/9*(9*3^(1/2)+12), -2/9*(12-9*3^(1/2))}
x in { -2/9*(9*3^(1/2)+12), -2/9*(12-9*3^(1/2)) }
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