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In the visual model of (2x + 5)², what forms the middle area?

Answer and explanation

Correct answer: 2·2x·5 = 20x

Direct answer: Option A, 2·2x·5 = 20x, is correct. A square with side 2x + 5 can be divided into a square of side 2x, a square of side 5, and two equal rectangles. Each rectangle has dimensions 2x and 5, so each has area (2x)(5) = 10x. Since there are two such rectangles, their total, or middle, area is 10x + 10x = 20x. This is also the middle term in (p + q)² = p² + 2pq + q². Option B gives the area of only one rectangle. Option C incorrectly adds unlike quantities and does not represent an area term. Option D is the sum of the two square areas, 4x² and 25, not the middle rectangles. Memory cue: the middle term of a square is twice the product of the two side parts.

Related tags

Middle TermBinomial SquareArea ModelRectangle AreasVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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