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In a square visual model, each side is divided into two parts, p and q. The four regions have areas p², pq, pq and q². Which algebraic identity does this model represent?

Answer and explanation

Correct answer: (p+q)²=p²+2pq+q²

The direct answer is A. Since the side of the complete square is made from p and q, the total side is p+q. Therefore the whole area is (p+q)². The four regions add to p²+pq+pq+q², and the two like terms combine to give p²+2pq+q². This proves (p+q)²=p²+2pq+q². B has the correct square-shaped pattern but applies to a difference and therefore has a negative middle term. C is the difference-of-squares identity and does not describe four positive regions inside one square of side p+q. D is a cubic expansion, which would involve volume-like terms and four terms of different degrees, not four areas. Memory cue: count the two pq regions; they are the source of the positive 2pq middle term.

Related tags

Algebraic IdentitiesVisual ModelsPerfect SquareTrinomialsArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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