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g in (-oo:+oo)
4*g^2-((9/2)*g) = 0
4*g^2+(-9/2)*g = 0
4*g^2-9/2*g = 0
DELTA = (-9/2)^2-(0*4*4)
DELTA = 81/4
DELTA > 0
g = ((81/4)^(1/2)+9/2)/(2*4) or g = (9/2-(81/4)^(1/2))/(2*4)
g = 9/8 or g = 0
g in { 0, 9/8 }
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