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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+22 = 2/x+2 // - 2/x+2
x-(2/x)-2+22 = 0
x-2*x^-1-2+22 = 0
1*x^1-2*x^-1+20*x^0 = 0
(1*x^2+20*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+20*x^1-2*x^0) = 0
x^1
x^2+20*x-2 = 0
x^2+20*x-2 = 0
DELTA = 20^2-(-2*1*4)
DELTA = 408
DELTA > 0
x = (408^(1/2)-20)/(1*2) or x = (-408^(1/2)-20)/(1*2)
x = (2*102^(1/2)-20)/2 or x = (-2*102^(1/2)-20)/2
x in { (-2*102^(1/2)-20)/2, (2*102^(1/2)-20)/2}
x in { (-2*102^(1/2)-20)/2, (2*102^(1/2)-20)/2 }
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