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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+35*x+28)/(x+6) = 0
5*x^2+35*x+28 = 0
5*x^2+35*x+28 = 0
DELTA = 35^2-(4*5*28)
DELTA = 665
DELTA > 0
x = (665^(1/2)-35)/(2*5) or x = (-665^(1/2)-35)/(2*5)
x = (665^(1/2)-35)/10 or x = (-(665^(1/2)+35))/10
(x+(665^(1/2)+35)/10)*(x-((665^(1/2)-35)/10)) = 0
((x+(665^(1/2)+35)/10)*(x-((665^(1/2)-35)/10)))/(x+6) = 0
( x+(665^(1/2)+35)/10 )
x+(665^(1/2)+35)/10 = 0 // - (665^(1/2)+35)/10
x = -((665^(1/2)+35)/10)
( x-((665^(1/2)-35)/10) )
x-((665^(1/2)-35)/10) = 0 // + (665^(1/2)-35)/10
x = (665^(1/2)-35)/10
x in { -((665^(1/2)+35)/10), (665^(1/2)-35)/10 }
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