Question

If x = √5 – 2, find the value of (i) (x – 1/x)3 (ii) x2 + 1/x2 (iii) x4 + 1/x4.​

Answer 1

(√5-2)-1/(√5-2)×3=-3

(√5-2)2+1/(√5-2)2=1

√5-2)4+1/√5-2)4=1