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In an area model of a square with side a+b, which parts represent a²+2ab+b²?

Answer and explanation

Correct answer: One a² square, one b² square, and two ab rectangles

The correct answer is A. Split both sides of the large square, whose side is a+b, into lengths a and b. The top-left or corresponding a-by-a region has area a². The b-by-b region has area b². The two remaining regions have dimensions a by b and b by a; each therefore has area ab. Together these two rectangles have area ab+ab = 2ab. The total area is consequently a²+2ab+b², which equals (a+b)². Option B contains only one mixed rectangle and gives a²+ab+b², so it is incomplete. Option C has four square regions instead of the required two squares and two rectangles. Option D changes two ab regions into an unrelated 2b² region. Memory cue: for a positive binomial square, count two end squares and two equal cross-rectangles.

Related tags

Algebraic IdentitiesArea ModelVisual ModelsBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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