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In which visual model is the small square actually 6 by 6 to complete (x²+12x+36)?

Answer and explanation

Correct answer: Model of a square with side (x+6)

The direct answer is A: the model is a square with side (x+6). To complete a square, compare x²+12x+36 with (x+k)^2=x²+2kx+k². The middle coefficient gives 2k=12, so k=6. The constant term confirms this because k²=6²=36. Visually, the x² tile is one large square, and the 12x area is split into two equal rectangles, each 6x. The missing corner is therefore a 6-by-6 square. B would create x²+24x+144. C gives (x+3)(x+9)=x²+12x+27, not 36. D gives (x−6)(x+6)=x²−36. Memory cue: halve the middle coefficient to find the side of the small corner square.

Related tags

Completing-SquareArea-ModelSmall-SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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