Question

What is the solution to this equation?

Answer 1

x = \[\sqrt{1/9 + (1/3 +1/9 + 1/27 + 1/81}\]

Answer 2

)*

Answer 3

1 1 1 1 1 9 + 27 + 9 + 3 + 1 49
--- + --- + --- + ---- + ---- = ------------------ = -----
9 3 9 27 81 81 81

so

\[x = \sqrt{49/81} = \sqrt{49}/\sqrt{81} = 7/9\]