Question

a+1/a=____ if a-1/a=9​

Answer 1

Answer:

We have a-1/a=9

since

(a+1/a)^2=(a-1/a)^2+4

(a+1/a)^2=9^2+4

(a+1/a)^2=81+4

(a+1/a)^2=85

(a+1/a)=√85