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h in (-oo:+oo)
(1/4)*h^2-((3/4)*h) = 0
(1/4)*h^2+(-3/4)*h = 0
1/4*h^2-3/4*h = 0
DELTA = (-3/4)^2-(0*1/4*4)
DELTA = 9/16
DELTA > 0
h = ((9/16)^(1/2)+3/4)/(1/4*2) or h = (3/4-(9/16)^(1/2))/(1/4*2)
h = 3 or h = 0
h in { 0, 3 }
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