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D( x )
(x-2)^2 = 0
(x-2)^2 = 0
(x-2)^2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
3-(3/((x-2)^2)) = 0
3-3*(x-2)^-2 = 0
3-3/((x-2)^2) = 0
(3*(x-2)^2)/((x-2)^2)-3/((x-2)^2) = 0
3*(x-2)^2-3 = 0
3*x^2-12*x+9 = 0
3*x^2-12*x+9 = 0
3*(x^2-4*x+3) = 0
x^2-4*x+3 = 0
DELTA = (-4)^2-(1*3*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+4)/(1*2) or x = (4-4^(1/2))/(1*2)
x = 3 or x = 1
3*(x-1)*(x-3) = 0
(3*(x-1)*(x-3))/((x-2)^2) = 0
(3*(x-1)*(x-3))/((x-2)^2) = 0 // * (x-2)^2
3*(x-1)*(x-3) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 1, 3 }
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