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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer. 

If (x + y)^2 =x^2 + y^2, which of the following statements must also be true?

Roman numeral 1. x = 0

Roman numeral 2.(x minus y)^2 = x^2 + y^2

Roman numeral 3. x times y = 0

Answer Choices
Want a hint?

This question uses the Roman numeral format. This format is used in both mathematics and critical reading passage questions. The way to approach these is to work on each Roman numeral as a separate true/false question. Once you have decided (and marked) each Roman numeral as true or false, it’s easy to find the correct answer.

In this problem, it is helpful to rewrite (x + y)^2 as x^2 + 2 times x times y + y^2.

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