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In a visual model, x²−6x must be completed into a square. Which corner should be added to get a perfect square?

Answer and explanation

Correct answer: 9

The correct answer is B: 9. The middle term −6x is made from two equal negative strips, each of size −3x, because −3x−3x=−6x. The missing corner has side lengths −3 in the signed model, and its area is (−3)(−3)=9. Thus x²−6x+9=(x−3)², a perfect square. Option A is the absolute value of the full coefficient and does not represent a square corner. Option C doubles the magnitude instead of halving it. Option D squares the full coefficient 6, but the corner is based on half the coefficient. Memory cue: ignore the sign while finding the area, halve the coefficient first, then square: (−6/2)²=9.

Related tags

Completing The SquareNegative Middle TermVisual Area ModelPerfect SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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