Final answer:
The expression that results in a difference of squares is (7+4)(7-4), which becomes 49-16 when applied to the difference of squares formula.
Step-by-step explanation:
The student is asking which expression results in a difference of squares. A difference of squares takes form when you have two terms being multiplied, where each term is a square and they are subtracted from each other, like (a+b)(a-b) which equals a2-b2.
The correct answer is a. (7+4)(7-4) because when you apply the difference of squares formula, you get 72 - 42 which is 49 - 16.
So, the pair of expressions that fits the form of the difference of squares is the first one, where 7 and 4 are being squared and subtracted.