Question

Q. If x = 4 - root 15 then find x power 4 + 1/x power 4

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Answer 1

x = 4 - √15

x² = 16 + 15 - 8√15 = 31 - 8√15

1/x² = 1/31 - 8√15 = (31+8√15) / 961-960 = 31+8√15

x² + 1/x² = 62

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Answer 2

Answer:

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