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If an area model is made for (x²−10x+25), what will be the side of the corner square?

Answer and explanation

Correct answer: 5

Direct answer: Option C, 5. Write the expression as x²−10x+25=x²−2·x·5+5²=(x−5)². In the area model, the corner square is the constant square whose area is 25. Since the area of a square is side², its side is √25=5. The negative middle term indicates subtractive strips; it does not make the corner side negative. Option A, 25, is the area of the corner square, not its side. Option B, 10, is the coefficient of the middle term and equals 2×5, not the side itself. Option C is correct because 5²=25 and 2x×5=10x. Option D, 15, neither has square 25 nor produces the required middle term. Memory cue: in x²−2kx+k², the small corner square has side k.

Related tags

Corner SquarePerfect SquareSubtraction ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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