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In an area model, the four parts of a rectangle are u², 2u, 5u, and 10. Which product does the whole rectangle show?

Answer and explanation

Correct answer: (u+2)(u+5)

Direct answer: C, (u+2)(u+5). In a rectangular area model, the four smaller areas come from multiplying each part of one side by each part of the other side. The u² region suggests u×u. The 2u region is u×2, and the 5u region is 5×u. The remaining corner is 2×5=10. Therefore the side lengths are u+2 and u+5, so the whole product is (u+2)(u+5). Expanding confirms it: u²+5u+2u+10=u²+7u+10. A has unmatched constants and does not produce the listed four regions. B would have two 2u regions and a corner 4. D would have two 5u regions and a corner 25. The corner product is a useful checking method.

Related tags

Area ModelFactor FormRectangle MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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