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In a visual model of a square with side (x − 5), what is the area of the small square formed by the constant part?

Answer and explanation

Correct answer: 25

Direct answer: C, 25. In the visual model for (x − 5)², the number 5 represents the length of the small side associated with the constant part. A square’s area is side × side, so this small square has area 5 × 5 = 25. Algebraically, (x − 5)² = x² − 10x + 25; the final constant term comes from squaring 5. Option A, 25x², incorrectly contains x² and would represent neither the constant square nor its area. Option B, 10x, is the combined middle term in magnitude, produced by two x-by-5 rectangles; it is not the small square’s area. Option C is correct because 5² = 25. Option D, x², is the area of the large x-by-x square, not the small constant square. Memory cue: the minus sign affects the middle term, but the square of 5 is positive.

Related tags

Binomial SquareConstant TermVisual ModelClass 9 AlgebraVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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