Question

Find the value of {x^-1 by x^} if x by 2 = 1 by 2x +1​

Answer 1

Answer:

Given,

x=1+

2

.

Now,

(x−

x

1

)

3

=(1+

2

−(

1+

2

1

))

3

=[1+

2

−(

2

+1

1

)×(

2

−1

2

−1

)]

3

=[1+

2

−(

2−1

2

−1

)]

3

=[1+

2

−(

2

−1)]

3

=(1+

2

−

2

+1)

3

=2

3

=8.