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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(x+1)/(2*x) = 4*x // - 4*x
(x+1)/(2*x)-(4*x) = 0
(x+1)/(2*x)-4*x = 0
(x+1)/(2*x)+(-4*2*x*x)/(2*x) = 0
x-4*2*x*x+1 = 0
x-8*x^2+1 = 0
x-8*x^2+1 = 0
x-8*x^2+1 = 0
DELTA = 1^2-(-8*1*4)
DELTA = 33
DELTA > 0
x = (33^(1/2)-1)/(-8*2) or x = (-33^(1/2)-1)/(-8*2)
x = (33^(1/2)-1)/(-16) or x = (33^(1/2)+1)/16
(x-((33^(1/2)-1)/(-16)))*(x-((33^(1/2)+1)/16)) = 0
((x-((33^(1/2)-1)/(-16)))*(x-((33^(1/2)+1)/16)))/(2*x) = 0
((x-((33^(1/2)-1)/(-16)))*(x-((33^(1/2)+1)/16)))/(2*x) = 0 // * 2*x
(x-((33^(1/2)-1)/(-16)))*(x-((33^(1/2)+1)/16)) = 0
( x-((33^(1/2)+1)/16) )
x-((33^(1/2)+1)/16) = 0 // + (33^(1/2)+1)/16
x = (33^(1/2)+1)/16
( x-((33^(1/2)-1)/(-16)) )
x-((33^(1/2)-1)/(-16)) = 0 // + (33^(1/2)-1)/(-16)
x = (33^(1/2)-1)/(-16)
x in { (33^(1/2)+1)/16, (33^(1/2)-1)/(-16) }
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