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In which visual situation can (x + 4)² - (x - 4)² be understood as the difference of the areas of two squares?

Answer and explanation

Correct answer: Two squares with sides x + 4 and x - 4

Answer: A. The area of a square is side × side, or side². Thus a square with side x + 4 has area (x + 4)², and a second square with side x - 4 has area (x - 4)². Subtracting the second area from the first gives exactly (x + 4)² - (x - 4)². Option B describes only one square-like area and cannot represent a difference of two square areas. Option C gives x² - x² = 0 because the squares are equal, not the given expression. Option D involves a circle, whose area is not represented by the square expressions here. The same model also connects to the identity A² - B² = (A + B)(A - B), but the visual meaning comes first: two square regions with different side lengths.

Related tags

Area-DifferenceTwo-SquaresVisual-IdentityDifference-Of-SquaresVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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