To solve this expression, we first need to distribute the terms in the parentheses:
(9 - 6m)(9 + 6m) + 6m(6m - 5)= 81 + 54m - 54m - 36m^2 + 6m*(6m - 5)= 81 - 36m^2 + 6m(6m) - 6m(5)= 81 - 36m^2 + 36m^2 - 30m= 81 - 30m
Therefore, the final answer is 81 - 30m.
To solve this expression, we first need to distribute the terms in the parentheses:
(9 - 6m)(9 + 6m) + 6m(6m - 5)
= 81 + 54m - 54m - 36m^2 + 6m*(6m - 5)
= 81 - 36m^2 + 6m(6m) - 6m(5)
= 81 - 36m^2 + 36m^2 - 30m
= 81 - 30m
Therefore, the final answer is 81 - 30m.