Question

a=9-4√5
find the value​

Answer 1

Answer:

18

This is because:

1/(9-4(5^(1/2)))

on multiplying up and down by

9+4(5^(1/2)) we get the answer

Answer 2

first we will rationalize the given no.

1 *9+4√5

-----------------

9-4√5*9+4√5

=9+4√5

=14√5

=√14*14*5

=980

hope it helps