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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = (14/5)*x // - (14/5)*x
4/x-((14/5)*x) = 0
(-14/5)*x+4/x = 0
4*x^-1-14/5*x^1 = 0
(4*x^0-14/5*x^2)/(x^1) = 0 // * x^2
x^1*(4*x^0-14/5*x^2) = 0
x^1
(-14/5)*x^2+4 = 0
(-14/5)*x^2+4 = 0
DELTA = 0^2-(4*4*(-14/5))
DELTA = 224/5
DELTA > 0
x = ((224/5)^(1/2)+0)/(2*(-14/5)) or x = (0-(224/5)^(1/2))/(2*(-14/5))
x = -5/28*(224/5)^(1/2) or x = 5/28*(224/5)^(1/2)
x in { -5/28*(224/5)^(1/2), 5/28*(224/5)^(1/2)}
x in { -5/28*(224/5)^(1/2), 5/28*(224/5)^(1/2) }
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