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D( v )
6*v^2+18*v-168 = 0
6*v^2+18*v-168 = 0
6*v^2+18*v-168 = 0
6*v^2+18*v-168 = 0
DELTA = 18^2-(-168*4*6)
DELTA = 4356
DELTA > 0
v = (4356^(1/2)-18)/(2*6) or v = (-4356^(1/2)-18)/(2*6)
v = 4 or v = -7
v in (-oo:-7) U (-7:4) U (4:+oo)
(v^2+8*v+7)/(6*v^2+18*v-168) = 0
v^2+8*v+7 = 0
v^2+8*v+7 = 0
DELTA = 8^2-(1*4*7)
DELTA = 36
DELTA > 0
v = (36^(1/2)-8)/(1*2) or v = (-36^(1/2)-8)/(1*2)
v = -1 or v = -7
(v+7)*(v+1) = 0
6*v^2+18*v-168 = 0
6*(v^2+3*v-28) = 0
v^2+3*v-28 = 0
DELTA = 3^2-(-28*1*4)
DELTA = 121
DELTA > 0
v = (121^(1/2)-3)/(1*2) or v = (-121^(1/2)-3)/(1*2)
v = 4 or v = -7
6*(v+7)*(v-4) = 0
((v+7)*(v+1))/(6*(v+7)*(v-4)) = 0
( v+1 )
v+1 = 0 // - 1
v = -1
( v+7 )
v+7 = 0 // - 7
v = -7
v in { -7}
v = -1
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