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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((0.65-x)^2)/x = 68 // - 68
((0.65-x)^2)/x-68 = 0
((0.65-x)^2)/x+(-68*x)/x = 0
(0.65-x)^2-68*x = 0
x^2-69.3*x+0.4225 = 0
x^2-69.3*x+0.4225 = 0
x^2-69.3*x+0.4225 = 0
DELTA = (-69.3)^2-(0.4225*1*4)
DELTA = 69.3^2-1.69
DELTA = 4800.8
DELTA > 0
x = ((69.3^2-1.69)^(1/2)+69.3)/(1*2) or x = (69.3-(69.3^2-1.69)^(1/2))/(1*2)
x = ((69.3^2-1.69)^(1/2)+69.3)/2 or x = (69.3-(69.3^2-1.69)^(1/2))/2
(x-((69.3-(69.3^2-1.69)^(1/2))/2))*(x-(((69.3^2-1.69)^(1/2)+69.3)/2)) = 0
((x-((69.3-(69.3^2-1.69)^(1/2))/2))*(x-(((69.3^2-1.69)^(1/2)+69.3)/2)))/x = 0
((x-((69.3-(69.3^2-1.69)^(1/2))/2))*(x-(((69.3^2-1.69)^(1/2)+69.3)/2)))/x = 0 // * x
(x-((69.3-(69.3^2-1.69)^(1/2))/2))*(x-(((69.3^2-1.69)^(1/2)+69.3)/2)) = 0
( x-(((69.3^2-1.69)^(1/2)+69.3)/2) )
x-(((69.3^2-1.69)^(1/2)+69.3)/2) = 0 // + ((69.3^2-1.69)^(1/2)+69.3)/2
x = ((69.3^2-1.69)^(1/2)+69.3)/2
( x-((69.3-(69.3^2-1.69)^(1/2))/2) )
x-((69.3-(69.3^2-1.69)^(1/2))/2) = 0 // + (69.3-(69.3^2-1.69)^(1/2))/2
x = (69.3-(69.3^2-1.69)^(1/2))/2
x in { ((69.3^2-1.69)^(1/2)+69.3)/2, (69.3-(69.3^2-1.69)^(1/2))/2 }
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