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A square model is to show ((2x+5)²). What will be the areas of the four parts?

Answer and explanation

Correct answer: (4x²), (10x), (10x), (25)

The direct answer is option A: 4x², 10x, 10x, and 25. Split each side of the large square into lengths 2x and 5. The corner square with side 2x has area (2x)(2x) = 4x². Each of the two remaining rectangles has dimensions 2x and 5, so each area is (2x)(5) = 10x. The small corner square with side 5 has area 5 × 5 = 25. Adding the four pieces gives 4x² + 10x + 10x + 25 = 4x² + 20x + 25, which is exactly (2x + 5)². Option B incorrectly uses 2x² for the first square and 5x for the rectangles. Option C doubles each rectangle area incorrectly. Option D gives one incorrect rectangle of area 25x. Memory cue: square each side for corner squares, and multiply the two different side lengths for each rectangle.

Related tags

Square ModelBinomial ExpansionArea PartsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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