quardatic

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

3 Answers

this simply difference of roots = 5

then √(b²-4ac)/a = 5

http://home.scarlet.be/~ping1339/elim.htm#Common-root-of-two-q

simple

for first u got it i think

for 2nd just solve the eqns by cross multiplication method..

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