Question

a =√2+1 find( a-1/a)^2​

Answer 1

Step-by-step explanation:

The answer is 2/3+2√2

I explained it

Answer 2

Answer:

a=√2+1

1/a = 1/√2+1

after rationalising the denominator,

1/a = √2-1

(a-1/a)²= a² + 1/a² + 2*a*1/a

= (√2+1)²+(√2-1)²+2

=(2+1+2√2)+(2+1-2√2)+2

=2+1+2√2+2+1-2√2+2

=8