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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-((7/2)*x)-4-4 = 0
(-7/2)*x+7/x-4-4 = 0
7*x^-1-7/2*x^1-8*x^0 = 0
(7*x^0-7/2*x^2-8*x^1)/(x^1) = 0 // * x^2
x^1*(7*x^0-7/2*x^2-8*x^1) = 0
x^1
(-7/2)*x^2-8*x+7 = 0
(-7/2)*x^2-8*x+7 = 0
DELTA = (-8)^2-(4*7*(-7/2))
DELTA = 162
DELTA > 0
x = (162^(1/2)+8)/(2*(-7/2)) or x = (8-162^(1/2))/(2*(-7/2))
x = (9*2^(1/2)+8)/(-7) or x = (8-9*2^(1/2))/(-7)
x in { (9*2^(1/2)+8)/(-7), (8-9*2^(1/2))/(-7)}
x in { (9*2^(1/2)+8)/(-7), (8-9*2^(1/2))/(-7) }
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