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In a rectangle with sides \(x+3\) and \(x+4\), what will be the two \(x\)-parts?

Answer and explanation

Correct answer: \(3x\) and \(4x\)

Correct answer: A. Split one side into x and 3, and the other side into x and 4. The four small regions then have areas x·x=x², x·4=4x, 3·x=3x, and 3·4=12. The two regions that contain one x and one constant are therefore 3x and 4x. Their combined contribution is 3x+4x=7x, but 7x is the sum of the two regions, not the names of the two separate parts. Option B lists the two diagonal corner regions, not the two x-containing mixed rectangles. Option C mixes a sum with a separate area, and D merely repeats side lengths. Memory cue: multiply the labels on the crossing sides of each small rectangle.

Related tags

Area ModelBinomial MultiplicationRectangle ExpansionVisual AlgebraVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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