Question

Pls answer the 1st qns it's very urgent I need the answer urgently Pls do this immediately and help me

Answer 1

hope this will help you .....

Answer 2

Given  :

The value of x - 1/x = 5

To find :

The value of x^3 - 1/x^3 .

Solution :

x - 1/x = 5

raising power to 3 both sides ,

     x^3 - 1/x^3 - 3 * x * 1/x * ( x - 1/x ) = 5 * 5 * 5

=>  x^3 - 1/x^3 - 3 * 5 = 125

=>  x^3 - 1/x^3 = 125 + 15

=>  x^3 - 1/x^3 = 140

The value of  x^3 - 1/x^3 is 140 .