Answer
$... =\displaystyle \frac{1}{8}\cdot\frac{1}{8}\cdot\frac{1}{8}\cdot\frac{1}{8}\cdot 8\cdot 8\cdot 8\cdot 8\cdot 8\cdot 8=8^{2}=8^{-4+6}$
Work Step by Step
$8^{-4}\displaystyle \cdot 8^{6}=\frac{1}{8}\cdot\frac{1}{8}\cdot\frac{1}{8}\cdot\frac{1}{8}\cdot 8\cdot 8\cdot 8\cdot 8\cdot 8\cdot 8$
$=8^{2}$
$=8^{-4+6}$
