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D( v )
v^2 = 0
v^2 = 0
v^2 = 0
1*v^2 = 0 // : 1
v^2 = 0
v = 0
v in (-oo:0) U (0:+oo)
v/(v^2)-(5*v) = 0
v/(v^2)-5*v = 0
1*v^-1-5*v^1 = 0
(1*v^0-5*v^2)/(v^1) = 0 // * v^2
v^1*(1*v^0-5*v^2) = 0
v^1
1-5*v^2 = 0
1-5*v^2 = 0
DELTA = 0^2-(-5*1*4)
DELTA = 20
DELTA > 0
v = (20^(1/2)+0)/(-5*2) or v = (0-20^(1/2))/(-5*2)
v = (-5^(1/2))/5 or v = (1*5^(1/2))/5
v in { (-5^(1/2))/5, (1*5^(1/2))/5}
v in { (-5^(1/2))/5, (1*5^(1/2))/5 }
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