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If \((x+2)(x+3)\) is shown by a rectangle, what is the sum of its four parts?

Answer and explanation

Correct answer: \(x^2+5x+6\)

Direct answer: option C, \(x^2+5x+6\). Divide one side of the rectangle into lengths \(x\) and 2, and the other side into \(x\) and 3. The four smaller rectangles have areas \(x\cdot x=x^2\), \(x\cdot3=3x\), \(2\cdot x=2x\), and \(2\cdot3=6\). Add them: \(x^2+3x+2x+6=x^2+5x+6\). This is also obtained by distribution: \((x+2)(x+3)=x^2+3x+2x+6\). Option A leaves out the two middle products and the constant product. Option B incorrectly uses \(6x\) as the middle term; 6 is the product of 2 and 3, not the sum of the two \(x\)-terms. Option D does not include all four products. Memory cue: multiply every term on the first side by every term on the second side, then combine like terms.

Related tags

Rectangle ModelBinomial MultiplicationArea ModelPolynomial ExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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