Question

If =1−√2, find 2+1by2

Answer 1

Step-by-step explanation:

=1-√2

1/a=1/(1-√2)

or, 1/a=(1+√2)/(1-√2)(1+√2)

or, 1/a=(1+√2)/(1-2)

or, 1/a=-(1+√2)

∴, (a-1/a)³=[(1-√2)-{-(1+√2)}]³=(1-√2+1+√2)³=2³=8

Answer 2

Answer:

I don't know........ sorry ,☹️☹️☹️☹️☹️☹️