a) $$(c+4)(c-1) - c^2 = c^2 - c + 4c - 4 - c^2 = 3c - 4$$
б) $$5(x-4) - (x+4)(x-4) = 5x - 20 - (x^2 - 16) = 5x - 20 - x^2 + 16 = -x^2 + 5x - 4$$
в) $$(3 - 4x)16x + (8x - 3)^2 = 48x - 64x^2 + 64x^2 - 48x + 9 = 9$$
Ответ:
a) $$3c - 4$$
б) $$-x^2 + 5x - 4$$
в) $$9$$