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D( x )
(x-5)^2 = 0
(x-5)^2 = 0
(x-5)^2 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
3-(3/((x-5)^2)) = 0
3-3*(x-5)^-2 = 0
3-3/((x-5)^2) = 0
(3*(x-5)^2)/((x-5)^2)-3/((x-5)^2) = 0
3*(x-5)^2-3 = 0
3*x^2-30*x+72 = 0
3*x^2-30*x+72 = 0
3*(x^2-10*x+24) = 0
x^2-10*x+24 = 0
DELTA = (-10)^2-(1*4*24)
DELTA = 4
DELTA > 0
x = (4^(1/2)+10)/(1*2) or x = (10-4^(1/2))/(1*2)
x = 6 or x = 4
3*(x-4)*(x-6) = 0
(3*(x-4)*(x-6))/((x-5)^2) = 0
(3*(x-4)*(x-6))/((x-5)^2) = 0 // * (x-5)^2
3*(x-4)*(x-6) = 0
( x-4 )
x-4 = 0 // + 4
x = 4
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 4, 6 }
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