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D( x )
3*x+2 = 0
3*x+2 = 0
3*x+2 = 0
3*x+2 = 0 // - 2
3*x = -2 // : 3
x = -2/3
x in (-oo:-2/3) U (-2/3:+oo)
(3*x^2+17*x+7)/(3*x+2) = 0
3*x^2+17*x+7 = 0
3*x^2+17*x+7 = 0
DELTA = 17^2-(3*4*7)
DELTA = 205
DELTA > 0
x = (205^(1/2)-17)/(2*3) or x = (-205^(1/2)-17)/(2*3)
x = (205^(1/2)-17)/6 or x = (-(205^(1/2)+17))/6
(x+(205^(1/2)+17)/6)*(x-((205^(1/2)-17)/6)) = 0
((x+(205^(1/2)+17)/6)*(x-((205^(1/2)-17)/6)))/(3*x+2) = 0
( x+(205^(1/2)+17)/6 )
x+(205^(1/2)+17)/6 = 0 // - (205^(1/2)+17)/6
x = -((205^(1/2)+17)/6)
( x-((205^(1/2)-17)/6) )
x-((205^(1/2)-17)/6) = 0 // + (205^(1/2)-17)/6
x = (205^(1/2)-17)/6
x in { -((205^(1/2)+17)/6), (205^(1/2)-17)/6 }
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