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If $\alpha$ and $\beta$ are the roots of the equation $x^2-2x+4=0,$ then $\alpha^9+\beta ^9=$

\[(a)\;-2^8 \quad (b)\;2^9 \quad (c)\;-2^{10} \quad (d)\;2^{10} \]
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1 Answer

$(c)\;-2^{10}$
answered Nov 7, 2013 by pady_1
 

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