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D( x )
2*x+5 = 0
2*x+5 = 0
2*x+5 = 0
2*x+5 = 0 // - 5
2*x = -5 // : 2
x = -5/2
x in (-oo:-5/2) U (-5/2:+oo)
(2*x^2+11*x+4)/(2*x+5) = 0
2*x^2+11*x+4 = 0
2*x^2+11*x+4 = 0
DELTA = 11^2-(2*4*4)
DELTA = 89
DELTA > 0
x = (89^(1/2)-11)/(2*2) or x = (-89^(1/2)-11)/(2*2)
x = (89^(1/2)-11)/4 or x = (-(89^(1/2)+11))/4
(x+(89^(1/2)+11)/4)*(x-((89^(1/2)-11)/4)) = 0
((x+(89^(1/2)+11)/4)*(x-((89^(1/2)-11)/4)))/(2*x+5) = 0
( x+(89^(1/2)+11)/4 )
x+(89^(1/2)+11)/4 = 0 // - (89^(1/2)+11)/4
x = -((89^(1/2)+11)/4)
( x-((89^(1/2)-11)/4) )
x-((89^(1/2)-11)/4) = 0 // + (89^(1/2)-11)/4
x = (89^(1/2)-11)/4
x in { -((89^(1/2)+11)/4), (89^(1/2)-11)/4 }
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