Question

a-1/a=3 find the value of a^2-1/a^2 the answer is 13 how

Answer 1

a-1/a=3........(1)

a^2-1/a^2=13(since a^-b^2=(a+b)(a-b))

(a+1/a)(a-1/a)=13(from....(1))

a+1/a=13/3

I think this may help you