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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(6*x^2+35*x+30)/(x+5) = 0
6*x^2+35*x+30 = 0
6*x^2+35*x+30 = 0
DELTA = 35^2-(4*6*30)
DELTA = 505
DELTA > 0
x = (505^(1/2)-35)/(2*6) or x = (-505^(1/2)-35)/(2*6)
x = (505^(1/2)-35)/12 or x = (-(505^(1/2)+35))/12
(x+(505^(1/2)+35)/12)*(x-((505^(1/2)-35)/12)) = 0
((x+(505^(1/2)+35)/12)*(x-((505^(1/2)-35)/12)))/(x+5) = 0
( x+(505^(1/2)+35)/12 )
x+(505^(1/2)+35)/12 = 0 // - (505^(1/2)+35)/12
x = -((505^(1/2)+35)/12)
( x-((505^(1/2)-35)/12) )
x-((505^(1/2)-35)/12) = 0 // + (505^(1/2)-35)/12
x = (505^(1/2)-35)/12
x in { -((505^(1/2)+35)/12), (505^(1/2)-35)/12 }
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