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If (x²-6x+9) is read through a visual model, which square is formed?

Answer and explanation

Correct answer: Square with side (x−3)

The direct answer is B: a square with side (x−3). Compare the expression with the identity (p−q)^2=p²−2pq+q². The first term x² is x², the last term 9 is 3², and the middle term is −6x=−2(x)(3). Therefore x²−6x+9=(x−3)^2. A would expand to x²+6x+9, so its middle sign is wrong. C would produce x²−12x+36, not the given expression. D would produce x²+18x+81, so both its middle and constant terms are wrong. In a visual model, the negative middle term means the side pieces are subtracted rather than added. Memory cue: a negative middle term usually signals a difference square.

Related tags

Difference-SquarePerfect-SquareVisual-RecognitionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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