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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x-(3*x) = 14 // - 14
15/x-(3*x)-14 = 0
15/x-3*x-14 = 0
15*x^-1-3*x^1-14*x^0 = 0
(15*x^0-3*x^2-14*x^1)/(x^1) = 0 // * x^2
x^1*(15*x^0-3*x^2-14*x^1) = 0
x^1
15-3*x^2-14*x = 0
15-3*x^2-14*x = 0
DELTA = (-14)^2-(-3*4*15)
DELTA = 376
DELTA > 0
x = (376^(1/2)+14)/(-3*2) or x = (14-376^(1/2))/(-3*2)
x = (2*94^(1/2)+14)/(-6) or x = (14-2*94^(1/2))/(-6)
x in { (2*94^(1/2)+14)/(-6), (14-2*94^(1/2))/(-6)}
x in { (2*94^(1/2)+14)/(-6), (14-2*94^(1/2))/(-6) }
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