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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)
(16*x^2-(5*x)-4)/(2*x+1) = 0
(16*x^2-5*x-4)/(2*x+1) = 0
16*x^2-5*x-4 = 0
16*x^2-5*x-4 = 0
DELTA = (-5)^2-(-4*4*16)
DELTA = 281
DELTA > 0
x = (281^(1/2)+5)/(2*16) or x = (5-281^(1/2))/(2*16)
x = (281^(1/2)+5)/32 or x = (5-281^(1/2))/32
(x-((5-281^(1/2))/32))*(x-((281^(1/2)+5)/32)) = 0
((x-((5-281^(1/2))/32))*(x-((281^(1/2)+5)/32)))/(2*x+1) = 0
( x-((281^(1/2)+5)/32) )
x-((281^(1/2)+5)/32) = 0 // + (281^(1/2)+5)/32
x = (281^(1/2)+5)/32
( x-((5-281^(1/2))/32) )
x-((5-281^(1/2))/32) = 0 // + (5-281^(1/2))/32
x = (5-281^(1/2))/32
x in { (281^(1/2)+5)/32, (5-281^(1/2))/32 }
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