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y in (-oo:+oo)
8*y^2-(((20*y)/4)*y^2)-(8*y) = 0
8*y^2-5*y^3-8*y = 0
8*y^2-5*y^3-8*y = 0
y*(8*y-5*y^2-8) = 0
8*y-5*y^2-8 = 0
DELTA = 8^2-(-8*(-5)*4)
DELTA = -96
DELTA < 0
y = 0
y = 0
y = 0
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