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Which visual model explains (25x^2-36)?

Answer and explanation

Correct answer: Remove the square of side (6) from the square of side (5x)

The direct answer is A. A square with side 5x has area (5x)^2=25x^2, and a square with side 6 has area 6^2=36. Therefore 25x^2-36 means subtracting the area of the smaller square from the area of the larger square. This is the visual meaning of a difference of two squares: a^2-b^2=(a+b)(a-b). Option A matches both areas and sides. B is wrong because a square of side 25x has area 625x^2, not 25x^2; it confuses a side with an area. C represents (5x+6)^2, which includes positive cross terms. D represents (5x-6)^2, which also includes a middle term and is not a difference of two square areas. Memory cue: first take square roots of the two terms, then draw one square being removed from the other.

Related tags

Algebraic IdentitiesDifference Of SquaresVisual ModelArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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