Question

if x =9-4√5 find : x-1/x​

Answer 1

Answer:

1/x = 1/9-4√5 = 1/9-4√5 x 9+4√5/9+4√5 = 9+4√5/ (9)² - (4√5)²

= 9+4√5/ 81 - 80 = 9+4√5/1 =

1/x = 9 + 4√5

so x - 1/x = 9-4√5 -(9+4√5

= 9-4√5 -9-4√5

= 2(4√5)

Brainliestr plz.

Step-by-step explanation: