SAT Math Multiple Choice Practice Question 357: Answer and Explanation

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Question: 357

5. If , which of the following equations expresses the fact that when the difference between x and y is multiplied by their sum, the product is 18?

A.
B.
C.
D.
E.

Correct Answer: D

Explanation:

D The difference between x and y is (x-y).

The sum of x and y is (x + y).

The product of those two is equal to 18:

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