Question

Plz help me .......​

Answer 1

What do u need help on write the question

Answer 2

198

Explanation:

Using the algebraic identity

(a + b)³ = a³ + b³ + 3ab(a + b) , then

with a = x and b =
`(1)/(x)`

(x +
`(1)/(x)` )³ = x³ +
`(1)/(x^3)` + 3 × x ×
`(1)/(x)` × 6

6³ = x³ +
`(1)/(x^3)` + 3 × 6

216 = x³ +
`(1)/(x^3)` + 18 ( subtract 18 from both sides )

198 = x³ +
`(1)/(x^3)`