Question

Reffer to above attachment

Ans. Is 8

STEP BY STEP EXPLANATION REQUIRED ;-)​

Answer 1

Step-by-step explanation:

x=1-√2

1/x=1/1-√2

=(1/1-√2)*(1+√2/1+√2)

=(1+√2)/1-2

=(1+√2)/-1

=-(1+√2)

x-1/x=1-√2-{-(1+√2)}

=1-√2+1+√2

=-2

(x+1/x)^3=(2)^3

(x+1/x)^3=8

HOPE IT HELPS FRIEND

Answer 2

Answer:

Step-by-step explanation:

X=1-√2

1/X=1/(1-√2)

Multiplying and dividing conjugate,

1/X=(1/(1-√2)) x ((1+√2)/(1+√2))

=(1+√2)/(1-2)

=-1-√2

So, x-1/X =(1-√2)-(-1-√2)

=2

Hence, (x-1/X)^3=2^3

=8