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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
(3*x^2+17*x+19)/(x+4) = 0
3*x^2+17*x+19 = 0
3*x^2+17*x+19 = 0
DELTA = 17^2-(3*4*19)
DELTA = 61
DELTA > 0
x = (61^(1/2)-17)/(2*3) or x = (-61^(1/2)-17)/(2*3)
x = (61^(1/2)-17)/6 or x = (-(61^(1/2)+17))/6
(x+(61^(1/2)+17)/6)*(x-((61^(1/2)-17)/6)) = 0
((x+(61^(1/2)+17)/6)*(x-((61^(1/2)-17)/6)))/(x+4) = 0
( x+(61^(1/2)+17)/6 )
x+(61^(1/2)+17)/6 = 0 // - (61^(1/2)+17)/6
x = -((61^(1/2)+17)/6)
( x-((61^(1/2)-17)/6) )
x-((61^(1/2)-17)/6) = 0 // + (61^(1/2)-17)/6
x = (61^(1/2)-17)/6
x in { -((61^(1/2)+17)/6), (61^(1/2)-17)/6 }
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