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s in (-oo:+oo)
4*s^2+4*s = 4*((s+1/2)^2-(1/4)) // - 4*((s+1/2)^2-(1/4))
4*s^2-(4*((s+1/2)^2-(1/4)))+4*s = 0
4*s^2-4*((s+1/2)^2-1/4)+4*s = 0
4*s^2-4*((s+1/2)^2-1/4)+4*s = 0
4*s-4*s = 0
0 = 0
0 = 0
s belongs to the empty set
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