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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((84-x)^2)/x = 4.31 // - 4.31
((84-x)^2)/x-4.31 = 0
((84-x)^2)/x+(-4.31*x)/x = 0
(84-x)^2-4.31*x = 0
x^2-172.31*x+7056 = 0
x^2-172.31*x+7056 = 0
x^2-172.31*x+7056 = 0
DELTA = (-172.31)^2-(1*4*7056)
DELTA = 172.31^2-28224
DELTA = 1466.7361
DELTA > 0
x = ((172.31^2-28224)^(1/2)+172.31)/(1*2) or x = (172.31-(172.31^2-28224)^(1/2))/(1*2)
x = ((172.31^2-28224)^(1/2)+172.31)/2 or x = (172.31-(172.31^2-28224)^(1/2))/2
(x-((172.31-(172.31^2-28224)^(1/2))/2))*(x-(((172.31^2-28224)^(1/2)+172.31)/2)) = 0
((x-((172.31-(172.31^2-28224)^(1/2))/2))*(x-(((172.31^2-28224)^(1/2)+172.31)/2)))/x = 0
((x-((172.31-(172.31^2-28224)^(1/2))/2))*(x-(((172.31^2-28224)^(1/2)+172.31)/2)))/x = 0 // * x
(x-((172.31-(172.31^2-28224)^(1/2))/2))*(x-(((172.31^2-28224)^(1/2)+172.31)/2)) = 0
( x-(((172.31^2-28224)^(1/2)+172.31)/2) )
x-(((172.31^2-28224)^(1/2)+172.31)/2) = 0 // + ((172.31^2-28224)^(1/2)+172.31)/2
x = ((172.31^2-28224)^(1/2)+172.31)/2
( x-((172.31-(172.31^2-28224)^(1/2))/2) )
x-((172.31-(172.31^2-28224)^(1/2))/2) = 0 // + (172.31-(172.31^2-28224)^(1/2))/2
x = (172.31-(172.31^2-28224)^(1/2))/2
x in { ((172.31^2-28224)^(1/2)+172.31)/2, (172.31-(172.31^2-28224)^(1/2))/2 }
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