Question

solve the given photo

Answer 1

I hope this will help you

as,a-1/3a =3

square on both sides

(a-1/3a)²=9²

a²+1/9a²-2/3 =81

a²+1/9a²=81+2/3

a²+1/9a²=245/3

and

(a²+1/9a²)²=(245/3)²

a⁴+1/81a⁴+2/9=64516/9

a⁴+1/81a⁴=64516/9- 2/9

a⁴+1/81a⁴=(64516-2)/9

a⁴+1/81a²=64514/27