Question

if x=2+√5 then x2+1/x2=​

Answer 1

Answer:

x = √5+2

1/x = √5-2

(x+1/x) = √5+2+√5-2 = 2√5

squaring both sides we get,

x²+1/x² + 2 = 20

x²+1/x² = 18 (Ans)

❤️ (Mark as brainlist) ❤️

Answer 2

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