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In the area model of (a + b)² = a² + 2ab + b², how is the 2ab part represented?

Answer and explanation

Correct answer: By two rectangles with sides a and b

Direct answer: Option A is correct. Imagine a large square whose side is a + b. Divide both its length and width into parts a and b. The four regions are an a by a square with area a², a b by b square with area b², and two rectangles, each measuring a by b. Each rectangle has area ab, so together they contribute ab + ab = 2ab. Option B represents only the a² region. Option C represents only the b² region. Option D represents the entire large square, whose area is (a + b)², not just the middle part. A common confusion is to count one rectangle and write ab; the second rectangle is essential, which is why the coefficient is 2.

Related tags

Square IdentityArea RepresentationCross RectanglesVisual AlgebraVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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