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If the outer side in a square model is (y+6), what is the area of the small corner square?

Answer and explanation

Correct answer: 36

The correct answer is D: 36. A square with side y+6 can be divided into a y×y square, two y×6 rectangles, and a small 6×6 corner square. The corner square uses the constant part of the side, which is 6 on both dimensions. Therefore its area is 6×6=36. The complete identity is (y+6)²=y²+12y+36. Option A is the area of the large y×y part, not the corner. Option B is the area of only one rectangle, y×6=6y. Option C is the combined area of the two rectangles, 6y+6y=12y. Option D correctly represents the remaining 6×6 square. Memory cue: in (variable+constant)², the small corner is the square of the constant: 6²=36.

Related tags

Area ModelSquare ExpansionConstant TermVisual IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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