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x in (-oo:+oo)
(3/8)*x-((11/4)*x^2) = 0
(-11/4)*x^2+(3/8)*x = 0
3/8*x-11/4*x^2 = 0
DELTA = (3/8)^2-(-11/4*0*4)
DELTA = 9/64
DELTA > 0
x = ((9/64)^(1/2)-3/8)/(-11/4*2) or x = (-(9/64)^(1/2)-3/8)/(-11/4*2)
x = 0 or x = 3/22
x in { 0, 3/22 }
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