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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)
(4*x^2+22*x+22)/(x+4) = 0
4*x^2+22*x+22 = 0
2*(2*x^2+11*x+11) = 0
2*x^2+11*x+11 = 0
DELTA = 11^2-(2*4*11)
DELTA = 33
DELTA > 0
x = (33^(1/2)-11)/(2*2) or x = (-33^(1/2)-11)/(2*2)
x = (33^(1/2)-11)/4 or x = (-(33^(1/2)+11))/4
2*(x+(33^(1/2)+11)/4)*(x-((33^(1/2)-11)/4)) = 0
(2*(x+(33^(1/2)+11)/4)*(x-((33^(1/2)-11)/4)))/(x+4) = 0
( x+(33^(1/2)+11)/4 )
x+(33^(1/2)+11)/4 = 0 // - (33^(1/2)+11)/4
x = -((33^(1/2)+11)/4)
( x-((33^(1/2)-11)/4) )
x-((33^(1/2)-11)/4) = 0 // + (33^(1/2)-11)/4
x = (33^(1/2)-11)/4
x in { -((33^(1/2)+11)/4), (33^(1/2)-11)/4 }
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