Answer:
[tex]b - {5b}^{9} - 8[/tex]
Step-by-step explanation:
1) Use product rule.
[tex]b - 5b ^{8 + 1} - 8[/tex]
2) Simplify 8 + 1 to 9.
Therefor, the answer is b - 5b⁹ - 8.