1) 16-b^2= 2) (11x+2)^2= 3) (5a-6b)^2= 4) (3-5a)^3=

1) 16 - b^2 = 4^2 - b^2 = (4 - b) * (4 + b);2) (11x + 2)^2 = (11x)^2 + 2 * 2 * 11x + 2^2 = 121x^2 + 44x + 4;3) (5a - 6b)^2 = (5a)^2 - 2 * 5a * 6b + (6b)^2 = 25a^2 - 60ab + 36b^2;4) (3 - 5a)^3 = 3^3 - 3 * 3^2 * (5a) + 3 * 3 * (5a)^2 - (5a)^3 = 9 - 135a + 225a^2 + 125a^3.