Xsqaure+1/xsquare=8, find x4+1/x4=?

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Rajnish Kumar 7 years, 6 months ago
x2+1/x2 = 8 then x4+1/x4=? on squaring both side
(x2+1/x2)2 = 82
x4+1/x4+2 = 64
x4+1/x4 = 64-2 = 62
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