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In a square of side (m+2), what is the total area of the two equal rectangles?

Answer and explanation

Correct answer: 4m

The correct answer is A: 4m. Split each side of the square into lengths m and 2. The area model for (m+2)² then contains an m×m square, two equal rectangles, and a 2×2 square. Each rectangle has dimensions m and 2, so its area is m×2=2m. Since there are two such rectangles, their total area is 2m+2m=4m. Option B is the area of only one rectangle. Option C is the area of the m×m square, not the two mixed rectangles. Option D is the area of the 2×2 corner square. The complete expansion confirms the result: (m+2)²=m²+4m+4. Memory cue: the two equal cross-pieces together give the middle term 2×m×2=4m.

Related tags

Visual ModelsArea Of RectanglesBinomial SquareAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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