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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/4)*x+2+16 = 4-8/x // - 4-8/x
(7/4)*x-(-8/x)-4+2+16 = 0
(7/4)*x+8*x^-1-4+2+16 = 0
7/4*x^1+8*x^-1+14*x^0 = 0
(7/4*x^2+14*x^1+8*x^0)/(x^1) = 0 // * x^2
x^1*(7/4*x^2+14*x^1+8*x^0) = 0
x^1
(7/4)*x^2+14*x+8 = 0
(7/4)*x^2+14*x+8 = 0
DELTA = 14^2-(4*8*(7/4))
DELTA = 140
DELTA > 0
x = (140^(1/2)-14)/(2*(7/4)) or x = (-140^(1/2)-14)/(2*(7/4))
x = 2/7*(2*35^(1/2)-14) or x = 2/7*(-2*35^(1/2)-14)
x in { 2/7*(-2*35^(1/2)-14), 2/7*(2*35^(1/2)-14)}
x in { 2/7*(-2*35^(1/2)-14), 2/7*(2*35^(1/2)-14) }
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