Question

If x= 2+√13 find x-1/x?​

Answer 1

Answer:

x=2+√13

1/x=1/(2+√13)

=1/2+√13×(2-√13)/(2-√13)

=(2-√13)/(4-13)

=(-2+√13)/9

x+1/x=2+√13+(-2+√13)/9

=(18+9√13+2+√13)/9

=(20+10√13)/9