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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(17/x)-20 > 3 // - 3
x-(17/x)-20-3 > 0
x-17*x^-1-20-3 > 0
x-17*x^-1-20-3 = 0
1*x^1-17*x^-1-23*x^0 = 0
(1*x^2-23*x^1-17*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-23*x^1-17*x^0) = 0
x^1
x^2-23*x-17 = 0
x^2-23*x-17 = 0
DELTA = (-23)^2-(-17*1*4)
DELTA = 597
DELTA > 0
x = (597^(1/2)+23)/(1*2) or x = (23-597^(1/2))/(1*2)
x = (597^(1/2)+23)/2 or x = (23-597^(1/2))/2
x in { (23-597^(1/2))/2, (597^(1/2)+23)/2}
(x-((23-597^(1/2))/2))*(x-((597^(1/2)+23)/2)) > 0
(-oo:(23-597^(1/2))/2) ((23-597^(1/2))/2:(597^(1/2)+23)/2) ((597^(1/2)+23)/2:+oo) x-((23-597^(1/2))/2) - + + x-((597^(1/2)+23)/2) - - +
x in (-oo:(23-597^(1/2))/2) U ((597^(1/2)+23)/2:+oo)
(-oo:(23-597^(1/2))/2) U ((597^(1/2)+23)/2:+oo)
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