Question

Please help me... I have awarded 30 points... Kindly answer question 'b'

Answer 1

Answer:

See attached picture for the answer to the question

Answer 2

Answer:

x - 1 / x =1/ 3

On cubing both sides ;

( x - 1 / x ) = (1/ 3 )³

Using Identity :

( a - b )³ = a³ - b³ - 3 ab ( a - b )

⇒ x³ - 1 / x³ - 3 ( x - 1 / x ) = 1/27

⇒ x³ - 1 / x³ - 3 ( 1/3 ) = 1/27

⇒ x³ - 1 / x³ - 1 = 1/27

⇒ x³ - 1 / x³ = 1/27 + 1

⇒ x³ - 1 / x³ = 28/27

Hence, the answer is 28/27