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In the visual model of (a+b+c)^2, which are the square parts?

Answer and explanation

Correct answer: a^2, b^2, c^2

The correct answer is A. A square model with side a+b+c has three same-part-by-same-part regions: an a-by-a square of area a^2, a b-by-b square of area b^2, and a c-by-c square of area c^2. The remaining regions are rectangles formed by unlike parts: ab, bc, and ca. Each unlike pair appears twice, so together they contribute 2ab+2bc+2ca. B lists the types of rectangular products, not square parts. C lists their combined doubled areas, also not squares. D is only a length, not an area. Memory cue: same letters multiplied form square regions; different letters multiplied form rectangles.

Related tags

Three-Term-SquareSquare-PartsVisual-ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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