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In the square model of side (x+2y+3z), what is the combined area of the rectangles containing yz?

Answer and explanation

Correct answer: 12yz

The direct answer is B: 12yz. Divide each side of the large square into lengths x, 2y and 3z. A rectangle containing the product yz must use the 2y strip in one direction and the 3z strip in the other direction. Its area is (2y)(3z)=6yz. Because the square is symmetric, there are two such rectangles: one above or beside the corresponding region and its matching partner across the diagonal. Their combined area is 6yz+6yz=12yz. A, 5yz, incorrectly adds the coefficients 2 and 3 instead of multiplying them. C is the area of only one yz rectangle, not both. D ignores the factor 2 and does not represent either the single or combined area correctly. Memory cue: in a square expansion, every pair of different side parts produces two matching rectangles.

Related tags

Three-Part SquareYz RectanglesVisual ExpansionArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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