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If x^4+1/x^4=257/16, then find 8/13(x^3 ...

If `x^4+1/x^4=257/16`, then find `8/13(x^3 +1/x^3)`, where x > 0.
यदि `x^4+1/x^4=257/16` है, तो `8/13(x^3 +1/x^3)` ज्ञात कीजिए जहाँ x>0 है।

A

5

B

4

C

6

D

8

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