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If in a square model the 36 corner is added with an x² tile but without adding two equal rectangles, why will a complete square not form?

Answer and explanation

Correct answer: Because the two middle 6x rectangles are missing

The direct answer is A: the two middle 6x rectangles are missing. A complete square with side x+6 has area (x+6)^2=x²+12x+36. The x² tile supplies the large corner, and the 36 tile supplies the small 6-by-6 corner. However, the two remaining strips must have areas 6x and 6x; together they supply the middle term 12x. If those rectangles are absent, the pieces have total area only x²+36, which is not generally equal to x²+12x+36 and cannot make the full square. B is false because 36=6² is a square. C is false because x² can represent a square area. D is false because x is a variable, not always 6. Memory cue: a square identity needs both equal cross rectangles, not just the two corner squares.

Related tags

Missing-Middle-TermsComplete-SquareError-AnalysisVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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