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v in (-oo:+oo)
8*v^2-(32*v)-((40/10)*v)-50 = 0
8*v^2-32*v-4*v-50 = 0
8*v^2-36*v-50 = 0
DELTA = (-36)^2-(-50*4*8)
DELTA = 2896
DELTA > 0
v = (2896^(1/2)+36)/(2*8) or v = (36-2896^(1/2))/(2*8)
v = (4*181^(1/2)+36)/16 or v = (36-4*181^(1/2))/16
v in { (36-4*181^(1/2))/16, (4*181^(1/2)+36)/16 }
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