URGENT!!!
Can someone please answer these 2 questions and show the working out?

A) Factor using the difference of squares formula: a^2 - b^2 = (a+b) (a-b)
a = X and B = 33
(x+33) (x-33)
b)
67^2 - 33^2 =
(67 * 67) - (33 * 33) =
4489 - 1089 = 3400