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In the area model of (p+q)^2, which two parts are always rectangles of equal area?

Answer and explanation

Correct answer: Two pq rectangles

The direct answer is A. Imagine a large square whose side is p+q. Divide each side into lengths p and q. The large square is then divided into four parts: one p by p square with area p^2, one q by q square with area q^2, and two rectangles. Each rectangle has one side p and the other side q, so each area is pq. Their combined area is pq+pq=2pq, giving the identity (p+q)^2=p^2+2pq+q^2. Therefore the two pq rectangles are always equal in area because they have the same dimensions, even if p and q are different. B is not always true: p^2 and q^2 are equal only when the magnitudes of p and q are equal. C and D compare a square with a rectangle, whose areas are not generally equal. Memory cue: the middle term 2pq comes from two matching cross-rectangles.

Related tags

Area ModelBinomial SquareEqual RectanglesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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