AlgebraQuestion 459 of 550

If x + y = 7 and x - y = 3, what is x² - y²?

  1. 10
  2. 21
  3. 4
  4. 49
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Correct answer: 21

x² - y² = (x + y)(x - y) = 7 × 3 = 21.

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Questions last reviewed: 21 October 2026