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If a rectangle is divided into parts \(x^2\), \(4x\), \(2x\), and \(8\), what can its dimensions be?

Answer and explanation

Correct answer: \(x+4\) and \(x+2\)

The direct answer is option B. In an area model, multiply the two total side lengths: \((x+4)(x+2)\). Distributing gives \(x\cdot x=x^2\), \(x\cdot2=2x\), \(4\cdot x=4x\), and \(4\cdot2=8\). These are exactly the four listed regions, so the rectangle can have dimensions \(x+4\) and \(x+2\). Option A would give \(x^2+9x+8\), so its middle parts do not match. Option C expands to \(x^2-6x+8\), containing negative mixed terms rather than the stated positive ones. Option D gives different coefficients and constant term. The corner region is a helpful clue: the constants 4 and 2 multiply to 8.

Related tags

Area ModelFactorisationRectangle DimensionsBinomial MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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