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Q)

If the equations $x^2+bx−1=0$ and $x^2+x+b=0$ have a common root different from $−1$, then $|b|$ is equal to :

$\begin{array}{1 1} (1) \sqrt 2 \\ (2)2 \\ (3) 3 \\ (4) \sqrt 3 \end{array} $

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