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A square visual model is divided into four regions with areas a^2, ab, ab, and b^2. Which algebraic identity does this model represent?

Answer and explanation

Correct answer: (a+b)^2=a^2+2ab+b^2

The direct answer is option A. Add the four region areas: a^2+ab+ab+b^2=a^2+2ab+b^2. The complete square has side length a+b, because one part of each side has length a and the other has length b. Therefore its total area is (a+b)^2, giving (a+b)^2=a^2+2ab+b^2. Option A is correct because there are two positive ab rectangles. Option B would require the two middle regions to be negative, as in a square of a difference. Option C describes a difference of two squares and uses multiplication of two binomials, not four positive regions of this model. Option D omits the two ab regions, so it misses part of the area. Memory cue: two identical ab rectangles combine to make 2ab.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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