(i)

We know that,

From formula (a – b)² = a² + b² – 2ab

=

=

So, by putting the values, we get,

= 5² =

=

(ii)

We know that,

From formula (a + b)² = a² + b² + 2ab

=

=

So, by putting the values, we get,

= 27² =

=