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If an area model shows 36x² - 1, which rectangle will be formed by the difference of squares?

Answer and explanation

Correct answer: (6x + 1)(6x - 1)

Answer: A, (6x + 1)(6x - 1). Recognise 36x² as (6x)² and 1 as 1². Therefore the expression is (6x)² - 1². Applying A² - B² = (A + B)(A - B) gives (6x + 1)(6x - 1). Option B uses 36x as the side instead of its square root, so its product begins with 1296x². Option C has unequal and unsuitable factors; its x² coefficient is 6, not 36, and its constant is -1. Option D uses 18x, whose square would be 324x², so it is also too large. The visual interpretation is two squares with sides 6x and 1; their difference can be rearranged into the stated rectangle. Memory cue: before factoring a difference of squares, take the square root of each square term, not the term itself.

Related tags

Difference-Of-SquaresArea-RectangleVisual-FactorizationPerfect-SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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