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Which model simplifies (x + y)² − y²?

Answer and explanation

Correct answer: Remove the square of side y from the square of side x + y

The correct model removes the square of side y from the square of side x + y. The expression itself is a subtraction of two areas: the large square has area (x + y)², and the removed small square has area y². The remaining area is (x + y)² − y². Using the difference-of-squares identity, this becomes [(x + y) − y][(x + y) + y] = x(x + 2y). Option A matches the original subtraction exactly. Option B represents (x − y)², which is a different expression and includes a different middle term. Option C represents only the product xy, not the full remaining area x(x + 2y). Option D keeps the removed part, so it represents only (x + y)² and does not perform the subtraction. The key visual idea is that subtraction of algebraic expressions corresponds to removing one area from another.

Related tags

Difference Of SquaresArea ModelVisual AlgebraFactoringVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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