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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(15/x) = 0
2*x-15*x^-1 = 0
2*x^1-15*x^-1 = 0
(2*x^2-15*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-15*x^0) = 0
x^1
2*x^2-15 = 0
2*x^2-15 = 0
DELTA = 0^2-(-15*2*4)
DELTA = 120
DELTA > 0
x = (120^(1/2)+0)/(2*2) or x = (0-120^(1/2))/(2*2)
x = (1*30^(1/2))/2 or x = (-30^(1/2))/2
x in { (-30^(1/2))/2, (1*30^(1/2))/2}
x in { (-30^(1/2))/2, (1*30^(1/2))/2 }
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