Question

answer this .......​

Answer 1

x + 1/x =7 cube this equation on both sides and u will get it answer

Answer 2

Step-by-step explanation:

x + 1/x =7

Cubing on both sides,

(x + 1/x)^3 = 7^3

x^3 + 1/x^3 + 3 * x * 1/x (x + 1/x) = 343

x^3 + 1/x^3 + 3 * 7 = 343

x^3 + 1/x^3 = 343 - 21

x^3 + 1/x^3 = 322( Ans.)

( ^ means to the power )