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: