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A visual model has a c² square, two 9c strips and an 81 corner. What is the side of the whole square?

Answer and explanation

Correct answer: c+9

The correct answer is A: c+9. The c² part is a square with side c because c×c=c². Each 9c strip has dimensions c and 9, so the added width is 9. The corner area is 81=9², confirming that its side is 9. Therefore the complete side of the large square is c+9. Algebraically, the model represents c²+9c+9c+81=c²+18c+81=(c+9)². Option B incorrectly adds the strip width twice to one side. Option C mixes area-like and length-like quantities and is not obtained from the model. Option D would describe a difference model and would produce negative middle terms. Add lengths along one side, not the two strip areas.

Related tags

Reverse-SquareVisual-ModelPerfect-SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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