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In the visual model of \((m+4)^2\), what is the area of the small constant square?

Answer and explanation

Correct answer: \(16\)

The correct answer is B: \(16\). In the model of \((m+4)^2\), one side is split into lengths \(m\) and \(4\), and the other side is split in the same way. The small corner has side length \(4\) on both directions, so its area is \(4\times4=4^2=16\). The \(m\)-by-\(m\) region has area \(m^2\), while the two mixed rectangles together have area \(4m+4m=8m\). Option A describes the variable square, not the constant corner. Option C describes only one mixed rectangle. Option D is the combined area of the two mixed rectangles, not the small square. Therefore B is the only answer that matches the constant corner. Memory cue: in \((m+c)^2\), the corner always contributes \(c^2\).

Related tags

Constant SquareBinomial SquareArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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