Question

If a=9+4 root 5 find a+1/a

Answer 1

Answer:

=-8√5

Step-by-step explanation:

a=9-4√5

1/a=1/(9-4√5)

=1*(9+4√5)/(9)2-(4√5)2

=(9+4√5)/81-80

=9+4√5

a-1/a=9-4√5-(9+4√5)

=9-4√5-9-4√5

=-8√5

Answer 2

Answer:

According to me, the answer is zero