Question

answer please.....my friends​

Answer 1

Answer:

18

Step-by-step explanation:

x+1/x=3

Cubing both sides

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

by

$({x} + y) {}^{3} = x {}^{3} + {y}^{3} + 3xy(x + y)$

x^3 +1/x^3 +3*x*1/x(x+1/x)=27

x^3 + 1/x^3 + 3×3=27

since (x+1/x)=3

x^3 + 1/x^3=27-9

x^3 + 1/x^3=18