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How many main parts are formed in the square model of side (a+b)?

Answer and explanation

Correct answer: Four

The correct answer is C, four. Divide each side of the square of side a+b into segments a and b. The two divisions create four regions: an a-by-a square with area a^2, an a-by-b rectangle with area ab, a second b-by-a rectangle with area ab, and a b-by-b square with area b^2. Adding them gives a^2+ab+ab+b^2=a^2+2ab+b^2. A is wrong because there are two square regions but also two rectangular regions. B is wrong because it misses one of the equal rectangles. D is wrong because no fifth region is created by the two side divisions. Memory cue: a two-part side creates four area blocks: square, rectangle, rectangle, square.

Related tags

Algebraic-IdentitiesVisual-ModelsArea-PartitionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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