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In a visual model, strips (4x) and (9x) are removed from an (x^2) square and a (36) corner is added. Which rectangle is formed?

Answer and explanation

Correct answer: (x-4)(x-9)

The direct answer is A. The x^2 square supplies the main x-by-x region. Removing a 4x strip reduces one side by 4, and removing a 9x strip reduces the other side by 9. The missing corner has area 4 times 9=36, so adding that corner completes the signed rectangle. Its side lengths are therefore x-4 and x-9, giving (x-4)(x-9)=x^2-13x+36. B would correspond to adding both strips, producing positive middle terms rather than removing them. C does not use the two separate strip widths as the factors and has an unrelated constant side. D incorrectly assumes the two removed widths are equal; 4 and 9 are different. Common-confusion warning: the corner 36 confirms 4*9, but it does not make the factors x-6 and x-6.

Related tags

Signed Area ModelFactorisationDifference Of StripsVisual AlgebraVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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