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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)
(3*x^2+23*x+28)/(x+6) = 0
3*x^2+23*x+28 = 0
3*x^2+23*x+28 = 0
DELTA = 23^2-(3*4*28)
DELTA = 193
DELTA > 0
x = (193^(1/2)-23)/(2*3) or x = (-193^(1/2)-23)/(2*3)
x = (193^(1/2)-23)/6 or x = (-(193^(1/2)+23))/6
(x+(193^(1/2)+23)/6)*(x-((193^(1/2)-23)/6)) = 0
((x+(193^(1/2)+23)/6)*(x-((193^(1/2)-23)/6)))/(x+6) = 0
( x+(193^(1/2)+23)/6 )
x+(193^(1/2)+23)/6 = 0 // - (193^(1/2)+23)/6
x = -((193^(1/2)+23)/6)
( x-((193^(1/2)-23)/6) )
x-((193^(1/2)-23)/6) = 0 // + (193^(1/2)-23)/6
x = (193^(1/2)-23)/6
x in { -((193^(1/2)+23)/6), (193^(1/2)-23)/6 }
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