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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
(5*x^2+33*x+13)/(x+6) = 0
5*x^2+33*x+13 = 0
5*x^2+33*x+13 = 0
DELTA = 33^2-(4*5*13)
DELTA = 829
DELTA > 0
x = (829^(1/2)-33)/(2*5) or x = (-829^(1/2)-33)/(2*5)
x = (829^(1/2)-33)/10 or x = (-(829^(1/2)+33))/10
(x+(829^(1/2)+33)/10)*(x-((829^(1/2)-33)/10)) = 0
((x+(829^(1/2)+33)/10)*(x-((829^(1/2)-33)/10)))/(x+6) = 0
( x+(829^(1/2)+33)/10 )
x+(829^(1/2)+33)/10 = 0 // - (829^(1/2)+33)/10
x = -((829^(1/2)+33)/10)
( x-((829^(1/2)-33)/10) )
x-((829^(1/2)-33)/10) = 0 // + (829^(1/2)-33)/10
x = (829^(1/2)-33)/10
x in { -((829^(1/2)+33)/10), (829^(1/2)-33)/10 }
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