If x 4-1 x 4-623- then x-1 x-a 27b 25c 33d - 33

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Algebraic Identities

If x 4+1 x 4=...

Question

If $x^{4} + \frac{1}{x^{4}} = 623$ , then $x + \frac{1}{x} =$

(a) 27

(b) 25

(c) $3 \sqrt{3}$

(d) $- 3 \sqrt{3}$

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