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?

I. x = 0

II.(x-y)^2 = (x^2) + (y^2)

III. xy = 0

(A) None

(B) I only

(C) II only

(D) III only

(E) II and III

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