Question

if you don't know the answer please don't give if you know the answer please give the answer please plz plz ​

Answer 1

Answer:

(x +1/x)² = x² +1/x² +2

(√5) ² = x²+1/x² + 2

5 = x²+1/x² +2

x²+1/x² = 3

(x²+1/x²) ² = x⁴+1/x⁴ +2

3² = x⁴+1/x⁴ +2

x⁴+1/x⁴ = 9-2

=7