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# The value of $'\alpha'$ for which the equation $x^3+ax+1=0$ and $x^4+ax^2+1=0$ have a common root is

$\begin {array} {1 1} (a)\;-2 & \quad (b)\;-1 \\ (c)\;1 & \quad (d)\;2 \end {array}$
Can you answer this question?

(a) -2
answered Nov 7, 2013 by