A) All you have to do is multiply the two values you get for the outer rectangle.
- (3x+4)(3x-4). When you expand it, you simply get 9x^2 - 16. This is easy because it’s something called the difference of 2 squares. When there’s a plus and a minus of the same number in different brackets, this occurs.
B) It’s the same concept as A
- (x-3)(x+3) expand that and you get x^2 - 9
C) is worded much harder than it truly is.
It’s simple area of larger rectangle subtract area of smaller rectangle.
9x^2 - x^2 - 16 - 9 which is 8x^2-25
