Question

if a=5-√2/2. find a-1/a​

Answer 1

Step-by-step explanation:

a = 5- root 2 /2

a-1/a = 5- root 2/2 -1 / 5- root 2/ 2

=( 5- root 2 - 2/ 2 )/ 5- root 2/ 2

= 3- root 2 / 5- root 2

( on rationalising this no.)

=( 15 + 3 root 2 - 5 root 2 - 2) / 23

= 13 - 2 root 2 / 23

Answer 2

this is the answer check it once it is correct or not