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A visual model contains a square of area k² and total strip area 12k. If the small square has area 36, what is the side of the whole square?

Answer and explanation

Correct answer: k+6

The correct answer is C: k+6. The small square has area 36, so its side is √36=6. In a square-completion model, the total strip area around the k² square is 2×k×6=12k, exactly as given. Therefore the whole square has side k+6, and its area is (k+6)² = k²+12k+36. Option A would produce a strip term 24k and a small square of area 144, so it does not fit. Option B gives a negative-side form and would produce −12k in the expansion. Option D gives leading term 36k² when squared, not k². The key is to find the side of the small 36-square first, then use the strip coefficient as a check. Memory cue: 12k=2×k×6, so the added side is 6.

Related tags

Completing The SquareStrip AreaPerfect SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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