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A visual rectangle model gives (x^2+13x+40). Which multiplication is correct for the small corner?

Answer and explanation

Correct answer: (5×8=40)

The governing idea is the rectangle or factor model for a quadratic expression. In x²+13x+40, the two smaller side lengths must multiply to the constant term 40, while their sum must produce the coefficient 13 of x. The pair 5 and 8 satisfies both relationships: 5×8=40 and 5+8=13. In the visual model, the product 5×8 represents the area of the small corner rectangle, and the two side contributions together create the 13x part. Option B is incorrect because 4×10 equals 40, not 13. Options C and D do not form the required factor pair. Therefore, option A is correct.

Related tags

Visual-ModelsFactor-PairsQuadratic-ExpressionsRectangle-AreaVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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