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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1 = 20*y-(5/y) // - 20*y-(5/y)
5/y-(20*y)+1 = 0
5/y-20*y+1 = 0
5*y^-1-20*y^1+1*y^0 = 0
(1*y^1-20*y^2+5*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^1-20*y^2+5*y^0) = 0
y^1
y-20*y^2+5 = 0
y-20*y^2+5 = 0
DELTA = 1^2-(-20*4*5)
DELTA = 401
DELTA > 0
y = (401^(1/2)-1)/(-20*2) or y = (-401^(1/2)-1)/(-20*2)
y = (401^(1/2)-1)/(-40) or y = (401^(1/2)+1)/40
y in { (401^(1/2)-1)/(-40), (401^(1/2)+1)/40}
y in { (401^(1/2)-1)/(-40), (401^(1/2)+1)/40 }
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