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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x-2 = 20/2-x // - 20/2-x
x+16/x-(20/2)-2 = 0
x+16/x-10-2 = 0
1*x^1+16*x^-1-12*x^0 = 0
(1*x^2-12*x^1+16*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-12*x^1+16*x^0) = 0
x^1
x^2-12*x+16 = 0
x^2-12*x+16 = 0
DELTA = (-12)^2-(1*4*16)
DELTA = 80
DELTA > 0
x = (80^(1/2)+12)/(1*2) or x = (12-80^(1/2))/(1*2)
x = (4*5^(1/2)+12)/2 or x = (12-4*5^(1/2))/2
x in { (12-4*5^(1/2))/2, (4*5^(1/2)+12)/2}
x in { (12-4*5^(1/2))/2, (4*5^(1/2)+12)/2 }
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