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![[Post New]](/templates/default/images/icon_minipost_new.gif) 11 Apr 2008 17:48:52 IST
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let z be the common root
then 2az3 + b z2 + cz + d =0 ...............1
and 2az2 + 3bz + 4c = 0........................2
equation 1 is
z( 2az2 + bz + c) +d = 0
replace the value of 2az2 from second and replace in 1
2bz2 + 3cz - d =0.......................3
now
z is the common root of 2 and 3
its easy afterwards
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