a+ 1/a=3

A square+1/ a square

= a square+1/ a square +2-2

=(a+ 1/a) square -2 (substituted in the above formula)

=9-2

=7

(a- 1/a) square

= a square -2+ 1/ A square (higher than a square+1/ A square =7)

=7-2

=5