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In which model can x^2-25=(x+5)(x-5) be seen most clearly?

Answer and explanation

Correct answer: Removing a square of side 5 from a square of side x

The correct answer is B. Since 25=5^2, x^2-25 means the area of a square of side x minus the area of a square of side 5. Begin with the large x-by-x square, whose area is x^2, and remove the smaller 5-by-5 square, whose area is 25. The remaining pieces can be rearranged into a rectangle with sides x+5 and x-5, proving x^2-25=(x+5)(x-5). A represents (x+5)^2, which is a sum-type square, not a difference. C represents 5x, only one product term. D represents (x-5)^2, which includes different terms. Memory cue: difference of squares is shown by subtracting one square from another, then rearranging the remainder.

Related tags

Difference-Of-SquaresVisual-ProofRearrangementVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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