Question

Hi! I just need some help with this question.

Answer 1

D. 18m-145

Explanation:

(M+8)(m-8) is just m^2-64. So (m-9)^2 is m^2-18m+81. So m^2-64-m^2+18m-81 is the answer. We can reduce into -64+18m-81 or 18m-145.