028.41. г) (c + 2)² - (c + 4)(c - 4) при с = 1/4;

г) ((c + 2)^2 - (c + 4)(c - 4) = (c^2 + 4c + 4) - (c^2 - 16) = c^2 + 4c + 4 - c^2 + 16 = 4c + 20). При (c = \frac{1}{4}): (4(\frac{1}{4}) + 20 = 1 + 20 = 21)