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In a square of side \((4x+3)\), what is the total area of both mixed strips?

Answer and explanation

Correct answer: \(24x\)

Answer: A, \(24x\). In the visual model, split each side of the square into lengths \(4x\) and \(3\). This creates four regions: a square of area \((4x)^2=16x^2\), a square of area \(3^2=9\), and two mixed rectangles. Each mixed rectangle has length \(4x\) and width \(3\), so its area is \(4x\times3=12x\). Since there are two such rectangles, their combined area is \(12x+12x=24x\), or directly \(2ab=2(4x)(3)=24x\). Option A is correct. Option B gives the area of only one mixed strip, not both. Option C is the large \(4x\)-square, not a mixed region. Option D is the small constant square. Memory cue: in \((a+b)^2\), the two mixed parts together always contribute \(2ab\).

Related tags

Algebraic IdentitiesVisual ModelsArea Of SquareMixed TermsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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