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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-3 = (8/2)*x+5 // - (8/2)*x+5
7/x-((8/2)*x)-5-3 = 0
7/x-4*x-5-3 = 0
7*x^-1-4*x^1-8*x^0 = 0
(7*x^0-4*x^2-8*x^1)/(x^1) = 0 // * x^2
x^1*(7*x^0-4*x^2-8*x^1) = 0
x^1
7-4*x^2-8*x = 0
7-4*x^2-8*x = 0
DELTA = (-8)^2-(-4*4*7)
DELTA = 176
DELTA > 0
x = (176^(1/2)+8)/(-4*2) or x = (8-176^(1/2))/(-4*2)
x = (4*11^(1/2)+8)/(-8) or x = (8-4*11^(1/2))/(-8)
x in { (4*11^(1/2)+8)/(-8), (8-4*11^(1/2))/(-8)}
x in { (4*11^(1/2)+8)/(-8), (8-4*11^(1/2))/(-8) }
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