The expression is
[tex]\frac{7^4}{7^{-5}}[/tex]When you divide exponents with the same base number, in this example the base number is 7, you have to subtract the exponents. The base number remains unchanged:
[tex]\frac{7^4}{7^{-5}}=7^{4-(-5)}=7^{4+5}=7^9[/tex]