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A student writes only one middle strip of area 6x in the model of (2x+3)^2. What visual correction is needed to obtain the correct middle term?

Answer and explanation

Correct answer: Add one more 6x strip

Correct answer: A, add one more 6x strip. The square has side 2x+3, so its area is (2x+3)^2. In the visual model, the 2x by 3 parts occur twice: one rectangle has area (2x)(3)=6x, and the other has area (3)(2x)=6x. Together they form the middle term 6x+6x=12x. The 4x^2 region is correct because it comes from (2x)(2x), and the 9 corner is also correct because it comes from 3×3. Option B would remove a required region and leave only 6x. Option C gives the wrong dimensions and does not represent the missing region. Option D removes the main square region, which is essential. Common confusion: a middle term in a square model may be made from two equal rectangles, so do not count only one strip.

Related tags

Visual-SquareError-AnalysisMiddle-TermAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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