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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-((2/11)*x) = 0
(-2/11)*x+4/x = 0
4*x^-1-2/11*x^1 = 0
(4*x^0-2/11*x^2)/(x^1) = 0 // * x^2
x^1*(4*x^0-2/11*x^2) = 0
x^1
(-2/11)*x^2+4 = 0
(-2/11)*x^2+4 = 0
DELTA = 0^2-(4*4*(-2/11))
DELTA = 32/11
DELTA > 0
x = ((32/11)^(1/2)+0)/(2*(-2/11)) or x = (0-(32/11)^(1/2))/(2*(-2/11))
x = -11/4*(32/11)^(1/2) or x = 11/4*(32/11)^(1/2)
x in { -11/4*(32/11)^(1/2), 11/4*(32/11)^(1/2)}
x in { -11/4*(32/11)^(1/2), 11/4*(32/11)^(1/2) }
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