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http://home.scarlet.be/~ping1339/elim.htm#Common-root-of-two-q
1.find the condition that the root of the equation ax^2+bx+c=0 may differ by 5.
2.if the equation x^2+px+q=0 and x^2+p'x+q'=0 have a common root ,show that it must be equal to
pq'-- p'q/q--q' or q--q'/p'--p
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3 Answers
6simple
for first u got it i think
for 2nd just solve the eqns by cross multiplication method..
