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If the model of a^2+2ab+b^2 makes a complete square, what is missing if only a^2+b^2 is kept?

Answer and explanation

Correct answer: Two ab rectangles

The correct answer is A. The identity (a+b)^2=a^2+2ab+b^2 is represented by one a^2 square, one b^2 square, and two equal rectangles, each with area ab. If only a^2 and b^2 are kept, the two cross-shaped rectangular regions are absent. Their combined area is ab+ab=2ab, and without them the pieces cannot form the complete square with side a+b. Option B is not an area piece in this model; it describes a length rather than a missing region. Option C belongs to a different signed or difference expression and has the wrong dimensions for the missing pair. Option D repeats b^2 squares, but the model needs one b^2 corner square and two ab rectangles. Memory cue: in (a+b)^2, the middle term 2ab comes from two equal rectangles.

Related tags

Missing-TilesPerfect-SquareVisual-IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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