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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15*x-16 = 15/x // - 15/x
15*x-(15/x)-16 = 0
15*x-15*x^-1-16 = 0
15*x^1-15*x^-1-16*x^0 = 0
(15*x^2-16*x^1-15*x^0)/(x^1) = 0 // * x^2
x^1*(15*x^2-16*x^1-15*x^0) = 0
x^1
15*x^2-16*x-15 = 0
15*x^2-16*x-15 = 0
DELTA = (-16)^2-(-15*4*15)
DELTA = 1156
DELTA > 0
x = (1156^(1/2)+16)/(2*15) or x = (16-1156^(1/2))/(2*15)
x = 5/3 or x = -3/5
x in { -3/5, 5/3}
x in { -3/5, 5/3 }
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