Question

If x + 1/x = 11,find the value of:

(i) x² + 1/x ²

(ii) (ii) x³+ 1/x ³​

Answer 1

x+1/x=11

1. x2+1/x2=>

((x+1/x)^2)-(2)

121-2=119

2.x3+1/x3=>

(x+1/x)^3-(3(x+1/x))

1331-33=1298