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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)
x = 4*x-((8/(x-4))*(x+1)) // - 4*x-((8/(x-4))*(x+1))
(8/(x-4))*(x+1)+x-(4*x) = 0
(8/(x-4))*(x+1)+x-4*x = 0
(8*(x+1))/(x-4)+x-4*x = 0
(8*(x+1))/(x-4)+(x*(x-4))/(x-4)+(-4*x*(x-4))/(x-4) = 0
8*(x+1)+x*(x-4)-4*x*(x-4) = 0
x^2-4*x^2+4*x+16*x+8 = 0
20*x-3*x^2+8 = 0
20*x-3*x^2+8 = 0
20*x-3*x^2+8 = 0
DELTA = 20^2-(-3*4*8)
DELTA = 496
DELTA > 0
x = (496^(1/2)-20)/(-3*2) or x = (-496^(1/2)-20)/(-3*2)
x = (4*31^(1/2)-20)/(-6) or x = (-4*31^(1/2)-20)/(-6)
(x-((4*31^(1/2)-20)/(-6)))*(x-((-4*31^(1/2)-20)/(-6))) = 0
((x-((4*31^(1/2)-20)/(-6)))*(x-((-4*31^(1/2)-20)/(-6))))/(x-4) = 0
((x-((4*31^(1/2)-20)/(-6)))*(x-((-4*31^(1/2)-20)/(-6))))/(x-4) = 0 // * x-4
(x-((4*31^(1/2)-20)/(-6)))*(x-((-4*31^(1/2)-20)/(-6))) = 0
( x-((-4*31^(1/2)-20)/(-6)) )
x-((-4*31^(1/2)-20)/(-6)) = 0 // + (-4*31^(1/2)-20)/(-6)
x = (-4*31^(1/2)-20)/(-6)
( x-((4*31^(1/2)-20)/(-6)) )
x-((4*31^(1/2)-20)/(-6)) = 0 // + (4*31^(1/2)-20)/(-6)
x = (4*31^(1/2)-20)/(-6)
x in { (-4*31^(1/2)-20)/(-6), (4*31^(1/2)-20)/(-6) }
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