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In which situation will the small corner of the visual model have area 12?

Answer and explanation

Correct answer: Rectangle (x+3)(x+4)

Direct answer: A, the rectangle (x+3)(x+4). In a rectangle model, split one side into x and 3 and the other side into x and 4. The small corner is formed by the two constant pieces, so its area is 3×4=12. The full expansion is x²+4x+3x+12=x²+7x+12, and the final constant term confirms the corner area. B is wrong because the two constant pieces are 12 and 12, giving 12×12=144. C gives 2×5=10, not 12. D gives 6×6=36. Notice that the corner area is found by multiplying the two pieces that meet there, not by adding them. Memory cue: in (x+p)(x+q), the corner is pq and the two side strips together give (p+q)x.

Related tags

Rectangle-ModelConstant-TermArea-PartsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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