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X in (-oo:+oo)
4*X^2-((300/6)*X) = 0
4*X^2-50*X = 0
4*X^2-50*X = 0
DELTA = (-50)^2-(0*4*4)
DELTA = 2500
DELTA > 0
X = (2500^(1/2)+50)/(2*4) or X = (50-2500^(1/2))/(2*4)
X = 25/2 or X = 0
X in { 0, 25/2 }
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