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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15*x-(4/x)-17 = 0
15*x-4*x^-1-17 = 0
15*x^1-4*x^-1-17*x^0 = 0
(15*x^2-17*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(15*x^2-17*x^1-4*x^0) = 0
x^1
15*x^2-17*x-4 = 0
15*x^2-17*x-4 = 0
DELTA = (-17)^2-(-4*4*15)
DELTA = 529
DELTA > 0
x = (529^(1/2)+17)/(2*15) or x = (17-529^(1/2))/(2*15)
x = 4/3 or x = -1/5
x in { -1/5, 4/3}
x in { -1/5, 4/3 }
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