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D( x )
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
(4*x^2+5*x-4)/(2*x+1) = 0
4*x^2+5*x-4 = 0
4*x^2+5*x-4 = 0
DELTA = 5^2-(-4*4*4)
DELTA = 89
DELTA > 0
x = (89^(1/2)-5)/(2*4) or x = (-89^(1/2)-5)/(2*4)
x = (89^(1/2)-5)/8 or x = (-(89^(1/2)+5))/8
(x+(89^(1/2)+5)/8)*(x-((89^(1/2)-5)/8)) = 0
((x+(89^(1/2)+5)/8)*(x-((89^(1/2)-5)/8)))/(2*x+1) = 0
( x+(89^(1/2)+5)/8 )
x+(89^(1/2)+5)/8 = 0 // - (89^(1/2)+5)/8
x = -((89^(1/2)+5)/8)
( x-((89^(1/2)-5)/8) )
x-((89^(1/2)-5)/8) = 0 // + (89^(1/2)-5)/8
x = (89^(1/2)-5)/8
x in { -((89^(1/2)+5)/8), (89^(1/2)-5)/8 }
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