1.

Let a,b be the solutions of x^(2)+px+1=0 and c, d be the solutions of x^(2)+qx+1=0. If (a-c)(b-c) and (a+d)(b+d) are the solutions of x^(2)+ax+beta=0, then beta equals

Answer»

<P>`p+Q`
`p-q`
`p^(2)+q^(2)`
`p^(2)-q^(2)`

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