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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(x^2+7*x+4)/(x+3) = 0
x^2+7*x+4 = 0
x^2+7*x+4 = 0
DELTA = 7^2-(1*4*4)
DELTA = 33
DELTA > 0
x = (33^(1/2)-7)/(1*2) or x = (-33^(1/2)-7)/(1*2)
x = (33^(1/2)-7)/2 or x = (-(33^(1/2)+7))/2
(x+(33^(1/2)+7)/2)*(x-((33^(1/2)-7)/2)) = 0
((x+(33^(1/2)+7)/2)*(x-((33^(1/2)-7)/2)))/(x+3) = 0
( x+(33^(1/2)+7)/2 )
x+(33^(1/2)+7)/2 = 0 // - (33^(1/2)+7)/2
x = -((33^(1/2)+7)/2)
( x-((33^(1/2)-7)/2) )
x-((33^(1/2)-7)/2) = 0 // + (33^(1/2)-7)/2
x = (33^(1/2)-7)/2
x in { -((33^(1/2)+7)/2), (33^(1/2)-7)/2 }
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