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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x+5 = x+8 // - x+8
10/x-x-8+5 = 0
10*x^-1-1*x^1-3*x^0 = 0
(10*x^0-1*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(10*x^0-1*x^2-3*x^1) = 0
x^1
10-x^2-3*x = 0
10-x^2-3*x = 0
DELTA = (-3)^2-(-1*4*10)
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(-1*2) or x = (3-49^(1/2))/(-1*2)
x = -5 or x = 2
x in { -5, 2}
x in { -5, 2 }
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