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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/4)*x+2/x = 15 // - 15
(7/4)*x+2/x-15 = 0
7/4*x^1+2*x^-1-15*x^0 = 0
(7/4*x^2-15*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(7/4*x^2-15*x^1+2*x^0) = 0
x^1
(7/4)*x^2-15*x+2 = 0
(7/4)*x^2-15*x+2 = 0
DELTA = (-15)^2-(2*4*(7/4))
DELTA = 211
DELTA > 0
x = (211^(1/2)+15)/(2*(7/4)) or x = (15-211^(1/2))/(2*(7/4))
x = 2/7*(211^(1/2)+15) or x = 2/7*(15-211^(1/2))
x in { 2/7*(15-211^(1/2)), 2/7*(211^(1/2)+15)}
x in { 2/7*(15-211^(1/2)), 2/7*(211^(1/2)+15) }
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