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If the side of a square is (x+2), which part will not appear among its four regions?

Answer and explanation

Correct answer: 3x

Direct answer: B, 3x. Split each side of the square into x and 2. The four regions are formed by pairing these lengths: x×x=x², x×2=2x, 2×x=2x, and 2×2=4. Thus the visual model contains one x² square, two rectangles each with area 2x, and one small square with area 4. The expansion confirms this: (x+2)²=x²+2x+2x+4=x²+4x+4. A appears as the large x-by-x square. C appears twice as the two equal rectangles. D appears as the 2-by-2 corner square. B, 3x, is not the area of any individual region. Even though terms can sometimes be combined algebraically, the model’s separate regions are determined by the actual side partitions, so 3x does not appear. Do not confuse the combined 4x with an individual 3x region.

Related tags

Four RegionsSquare ModelArea DecompositionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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