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x in (-oo:+oo)
16*x-((-2*2*x*x)/2) = 0
2*x^2+16*x = 0
2*x^2+16*x = 0
DELTA = 16^2-(0*2*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)-16)/(2*2) or x = (-256^(1/2)-16)/(2*2)
x = 0 or x = -8
x in { -8, 0 }
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