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p in (-oo:+oo)
(3/8)*p-((7/2)*p^2) = 0
(-7/2)*p^2+(3/8)*p = 0
3/8*p-7/2*p^2 = 0
DELTA = (3/8)^2-(-7/2*0*4)
DELTA = 9/64
DELTA > 0
p = ((9/64)^(1/2)-3/8)/(-7/2*2) or p = (-(9/64)^(1/2)-3/8)/(-7/2*2)
p = 0 or p = 3/28
p in { 0, 3/28 }
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