For this case, we have that by definition of properties of powers and radicals that:
[tex]x ^ {\frac {1} {2}} = \sqrt {x ^ 1} = \sqrt {x}[/tex]
In this case we have the following expression:
[tex]a ^ {\frac {5} {7}}[/tex]
Applying the aforementioned property we have to:
[tex]a ^ {\frac {5} {7}} = \sqrt [7] {a ^ 5}[/tex]
Answer:
[tex]a ^ {\frac {5} {7}} = \sqrt [7] {a ^ 5}[/tex]
