Question

If the equation x + 3 px? + 3x + r=0 and x? +2 px +9=0 have a common root, then
4(p²-9)q? - pr)
(A) (pr - q)
(B) (qr - p)
(C) (pq-r)*2
(D) None of these​

Answer 1

C) (pq-r)*2

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