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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+(3/0.5)*x+1/x+3+13 = 1 // - 1
x+(3/0.5)*x+1/x-1+3+13 = 0
7*x^1+1*x^-1+15*x^0 = 0
(7*x^2+15*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(7*x^2+15*x^1+1*x^0) = 0
x^1
7*x^2+15*x+1 = 0
7*x^2+15*x+1 = 0
DELTA = 15^2-(1*4*7)
DELTA = 197
DELTA > 0
x = (197^(1/2)-15)/(2*7) or x = (-197^(1/2)-15)/(2*7)
x = (197^(1/2)-15)/14 or x = (-(197^(1/2)+15))/14
x in { (-(197^(1/2)+15))/14, (197^(1/2)-15)/14}
x in { (-(197^(1/2)+15))/14, (197^(1/2)-15)/14 }
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