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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
2/h-((1/3)*h)+11 = 0
(-1/3)*h+2/h+11 = 0
2*h^-1-1/3*h^1+11*h^0 = 0
(11*h^1-1/3*h^2+2*h^0)/(h^1) = 0 // * h^2
h^1*(11*h^1-1/3*h^2+2*h^0) = 0
h^1
(-1/3)*h^2+11*h+2 = 0
(-1/3)*h^2+11*h+2 = 0
DELTA = 11^2-(2*4*(-1/3))
DELTA = 371/3
DELTA > 0
h = ((371/3)^(1/2)-11)/(2*(-1/3)) or h = (-(371/3)^(1/2)-11)/(2*(-1/3))
h = -3/2*((371/3)^(1/2)-11) or h = 3/2*((371/3)^(1/2)+11)
h in { -3/2*((371/3)^(1/2)-11), 3/2*((371/3)^(1/2)+11)}
h in { -3/2*((371/3)^(1/2)-11), 3/2*((371/3)^(1/2)+11) }
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