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