In order to get the answer to this question you must first have to convert the exponents into full numbers then subtract the full numbers to get your answer.
[tex]8^9-6^7[/tex]
[tex]8^9 = 8\times8\times\88\times8\times8\times8\times8\times8\times8=[/tex] [tex]8\times8\times\88\times8\times8\times8\times8\times8\times8=134,217,728[/tex]
[tex]6^7 = 6\times6\times6\times6\times6\times6\times6=[/tex]
[tex]6\times6\times6\times6\times6\times6\times6=279,936[/tex]
[tex]134,217,728-279,936=133,937,792[/tex]
Which means the answer is "133,937,792."
Hope this helps.