Answer:
The last one
Explanation:
(2m - n) ^ 7 * c * a * n be expanded using the binomial theorem or pascal's triangle, but writing out the work is proving to be really difficult. the application of the theorem is pretty complicated and it isn't easy to format in this textbox.
the expansion of this would be 128m ^ 7 - 448m ^ 6 * n + 672m ^ 5 * n ^ 2 - 560m ^ 4 * n ^ 3 + 280m ^ 3 * n ^ 4 - 84m ^ 2 * n ^ 5 + 14m * n ^ 6 - n ^ 7.
hope this helped
