Expanding the expression using the distributive property:
9b(b-1)(b+1)= 9b(b^2 - b + b - 1)= 9b(b^2 - 1)= 9b^3 - 9b
Expanding the expression using the distributive property:
9b(b-1)(b+1)
= 9b(b^2 - b + b - 1)
= 9b(b^2 - 1)
= 9b^3 - 9b