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In the visual model, (x^2+12x+36) is a perfect square. What is the area of each equal rectangle?

Answer and explanation

Correct answer: 6x / area of each equal rectangle

The direct answer is option C: 6x. A square expression can be viewed as a large square together with two equal rectangular strips and a corner square. Here x^2 is the area of the square with side x, and 36 is the area of the corner square with side 6. The two equal middle rectangles together have area 12x, so each one has area 12x ÷ 2 = 6x. Option A is the combined area of both rectangles, not one rectangle. Option B, 36x, incorrectly mixes the constant corner value with x; the corner area is 36. Option C correctly gives the area of one equal strip. Option D, x+6, is a side length in the model, not an area. The identity is (x+6)^2 = x^2+12x+36. Memory cue: the middle term is twice one equal rectangle, so divide its coefficient by two.

Related tags

Equal RectanglesPerfect SquareArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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