find the square (2m-8)^2
(2m - 8)²(2m - 8)(2m - 8)2m(2m - 8) - 8(2m - 8)2m(2m) - 2m(8) - 8(2m) + 8(8)4m² - 16m - 16m + 644m² - 32m + 64