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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(3*x)-(40/x)-40 = 0
X^2-3*x-40*x^-1-40 = 0
-3*x^1-40*x^-1-40*x^0 = 0
(-3*x^2-40*x^1-40*x^0)/(x^1) = 0 // * x^2
x^1*(-3*x^2-40*x^1-40*x^0) = 0
x^1
-3*x^2-40*x-40 = 0
-3*x^2-40*x-40 = 0
DELTA = (-40)^2-(-40*(-3)*4)
DELTA = 1120
DELTA > 0
x = (1120^(1/2)+40)/(-3*2) or x = (40-1120^(1/2))/(-3*2)
x = (4*70^(1/2)+40)/(-6) or x = (40-4*70^(1/2))/(-6)
x in { (4*70^(1/2)+40)/(-6), (40-4*70^(1/2))/(-6)}
x in { (4*70^(1/2)+40)/(-6), (40-4*70^(1/2))/(-6) }
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