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A rectangle has length (x+10) and breadth (x-10). Which constant term is subtracted by the visual model?

Answer and explanation

Correct answer: 100

The correct answer is C: 100. The area of the rectangle is found by multiplying its length and breadth: (x+10)(x-10). This matches the difference-of-squares identity (p+q)(p-q)=p²-q². Here p=x and q=10, so the area is x²−10²=x²−100. In a visual model, the large x by x square has area x², while a 10 by 10 corner square is removed; that corner has area 100. Option A is only the side length 10, not its area. Option B is 10+10 and does not represent the removed square. Option D contains x, so it is not a constant. Memory cue: opposite binomials produce a difference of squares.

Related tags

Difference-Of-SquaresVisual-ModelConstant-TermVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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