Q .   I f   x   =   1 x - 5   a n d   x 5 ,   f i n d   :   x 3 + 1 x 3 .

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x3 + 1/x3 = (x+ 1/x)(x2+  1/x2 -1) = (x+ 5-x) ( (x+ 1/x)2 - 2-1) = 5*(52-2-1) = 110
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