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In an area model, into which four regions is a square of side (a + b) divided to represent (a + b)^2?

Answer and explanation

Correct answer: One a^2 square, two ab rectangles, and one b^2 square

The correct answer is A. Divide both sides of the large square, whose side is a + b, into segments of lengths a and b. The horizontal and vertical divisions create four regions. The a-by-a corner is a square of area a^2. The b-by-b corner is a square of area b^2. The two remaining regions each have dimensions a and b, so each is an ab rectangle. Their combined area is 2ab. Adding all four regions gives a^2 + ab + ab + b^2 = a^2 + 2ab + b^2 = (a + b)^2. Option B has two a^2 squares, but only one a-by-a region exists. Option C has two b^2 squares, which is also incorrect. Option D labels the middle regions by their total side length instead of their actual dimensions. Memory cue: a binomial square always has two end squares and two equal cross-rectangles.

Related tags

Binomial SquareArea ModelVisual IdentityAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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