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