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In a square of side b+6, if b² is the large part, what is the total area of the two rectangles?

Answer and explanation

Correct answer: 12b

The correct answer is B: 12b. A square of side b+6 has area (b+6)². Split each side into lengths b and 6. The model contains the large b by b square with area b², two rectangular strips, each with dimensions b and 6, and a corner square with area 6²=36. Each rectangle therefore has area 6b, so together they have area 6b+6b=12b. This is also the middle term in b²+12b+36. Option A counts only one rectangle. Option C uses the wrong multiplication, and option D adds the two square areas rather than finding the strips. The factor 2 in 2×b×6 represents the two equal rectangles.

Related tags

Square-ModelMiddle-TermAlgebraic-IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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