Question

if a=√2+1 then find value of a-¹/a​

Answer 1

Answer:

a=√2+1

1/a=1/√2+1

1/a=√2-1/2-1

1/a=√2-1

a-1/a=√2+1+√2-1=2√2

Answer 2

Answer:

a=√2+1

=a-1/a

=√2+1-1/√2+1

=[(√2+1)²-1]/√2+1

=(2+2√2+1-1)/√2+1

=(2+2√2)/√2+1

=2(√2+1)/(√2+1)

=2