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If a square with side 3x+4 is modeled, what will be the contribution of the constant square to the total area?

Answer and explanation

Correct answer: 16

Direct answer: Option D, 16, is correct. In the area model for a square with side 3x+4, each side is split into a variable part 3x and a constant part 4. The small corner formed by the two constant lengths has dimensions 4 by 4. Its area is therefore 4×4=4²=16. This is called the constant square because it contains no x. Option A is only the side length, not the area. Option B is twice the side length and does not describe a square area. Option C is the product of 3 and 4, which relates to a mixed rectangle rather than the constant corner square. Option D correctly identifies the contribution of the corner region. In a model of (3x+4)², the four-part expansion is 9x²+24x+16; the final constant term comes from this 4×4 square.

Related tags

Constant TermVisual Area ModelBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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