Question

if x+1/x=3 find x3+1/x3​

Answer 1

Answer:

18

Step-by-step explanation:

x+ 1/x = 3 ______ ( 1 )

{ x+ 1/x } ^3 = 27

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

x^3 + 1/x^3 + 3×3 = 27______ from (1)

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

x^3 + 1/x^3 = 18