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In the visual model of \((p+q)^2\), how many \(pq\) rectangles are formed?

Answer and explanation

Correct answer: 2

The direct answer is C: two \(pq\) rectangles. Imagine a square whose side is \(p+q\). Divide both the horizontal and vertical sides into lengths \(p\) and \(q\). This creates four regions: a \(p\times p\) square of area \(p^2\), a \(q imes q\) square of area \(q^2\), and two cross-rectangles. Each cross-rectangle has dimensions \(p\) and \(q\), so each has area \(pq\). Together they contribute \(pq+pq=2pq\). Hence \((p+q)^2=p^2+2pq+q^2\). A is wrong because there are two cross-rectangles, one on each side of the diagonal arrangement. B is wrong because three such rectangles would give \(3pq\), which is not the square identity. D confuses the total number of regions, which is four, with the number of \(pq\) rectangles; the other two regions are squares. Memory cue: four regions, but only two are mixed \(p\)-by-\(q\) rectangles.

Related tags

Square ExpansionVisual ModelMiddle TermAlgebraic IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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