Question

if a=9-4√5 then find the value of a-1/a. plz solve it in notebook and send me pic of ansr​

Answer 1

Step-by-step explanation:

a = 9-4√5

1/a = 1/(9-4√5) = (9+4√5)/(9-4√5)(9+4√5) =

(9+4√5)/(81-80) = (9+4√5)

a -1/a=>(9-4√5)-(9+4√5) = -8√5. Hope it helps you.