Answer:
[tex]( - \frac{5}{7} )^{17} [/tex]
Step-by-step explanation:
Indices law states that
[tex] {x}^{m} \times {x}^{n} = {x}^{m + n} [/tex]
Thus,
[tex]( - \frac{5}{7})^{8} \times ( - \frac{5}{7} )^{9} \\ = ( - \frac{5}{7} )^{8 + 9} \\ = ( - \frac{5}{7} )^{17} [/tex]
