The condition that a root of the equation ax+bx+c-o and ax+bx+4-0 common
1) (bb, -a) = (ab, - be, ba, - bc)
3) (cb, ba )' = (ac, -ca, Xab, - bc)
2) (ec -aa = (ab. - bc Xba - bc)
41 a+b+c=0
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