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Which model can change (x^2-25) into a rectangle with sides (x+5) and (x-5)?

Answer and explanation

Correct answer: Cut-and-rearrange difference-of-squares model

The direct answer is A. Since 25=5^2, the expression is x^2-5^2, a difference of squares. The identity a^2-b^2=(a+b)(a-b) gives x^2-25=(x+5)(x-5). In the visual model, remove a 5-by-5 square from an x-by-x square. The remaining pieces can be cut and rearranged into a rectangle whose sides are x+5 and x-5. B is wrong because a sum or perfect-square model describes expressions such as (x+5)^2, which has a positive middle term. C shows addition rather than removing a smaller square, and it does not produce the required unequal factors. D leaves only x^2 and does not represent the subtraction of 25. Common warning: difference of squares is not the same as (x-5)^2.

Related tags

Difference Of SquaresCut And RearrangeGeometric FactorisationVisual ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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