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In a square of side y + 6, the large square has area y². What is the combined area of the two strips?

Answer and explanation

Correct answer: 12y

The correct answer is B, 12y. The side y + 6 is divided into a part of length y and an extra part of length 6. In the area model, the large y by y square has area y². The two remaining strips are each formed by multiplying y by 6, so each strip has area 6y. Adding the equal strips gives 6y + 6y = 12y. Option A gives the area of only one strip, not both. Option C is incorrect because 36 would be the area of a 6 by 6 corner, and writing 36y has the wrong dimensions for that corner. Option D adds the y² square and the 6 by 6 corner, but the question asks only for the two strips. Common confusion: equal strips must be counted twice; this is why the middle term in (y + 6)² is 12y.

Related tags

Area ModelBinomial SquareVisual StripsMiddle TermVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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