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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
100/y = y // - y
100/y-y = 0
100*y^-1-1*y^1 = 0
(100*y^0-1*y^2)/(y^1) = 0 // * y^2
y^1*(100*y^0-1*y^2) = 0
y^1
100-y^2 = 0
100-y^2 = 0
DELTA = 0^2-(-1*4*100)
DELTA = 400
DELTA > 0
y = (400^(1/2)+0)/(-1*2) or y = (0-400^(1/2))/(-1*2)
y = -10 or y = 10
y in { -10, 10}
y in { -10, 10 }
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