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If a square model has x², two 6x rectangles, and a small square of area 36, what is the outer side?

Answer and explanation

Correct answer: x+6

The direct answer is A: x+6. The x² region is a square whose side is x, because x×x=x². The small square has area 36, so its side is 6, since 6×6=36. Each middle rectangle has area 6x, which is exactly x×6. Therefore the two side parts forming the outside edge have lengths x and 6, and the complete outer side is x+6. The full area confirms this: x²+6x+6x+36=x²+12x+36=(x+6)². Option B incorrectly adds 6 twice to the outside length; the two rectangles are placed on different sides, not end-to-end along one outer side. Option C uses subtraction and would correspond to a model involving a missing region or x−6. Option D is not a side length obtained from the pieces and mixes an area-like product with a length. Memory cue: identify the side of each square first, then add the adjacent side segments.

Related tags

Algebra-TilesOuter-SideComplete-SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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