Akar 7a pangkat 3 per 8??? Tolong kak pae jalan

[tex] {( \sqrt{7a} )}^{ \frac{3}{8} } \\ = { {7a}^{ \frac{1}{2} } }^{ \frac{ 3}{8} } \\ = {7a}^{ \frac{3}{16} } \\ = \sqrt[16]{ {7a}^{3} } [/tex]