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A model shows (x²+8x+15) and (x²+8x+16) together. How much larger is the second than the first?

Answer and explanation

Correct answer: 1, the corner difference

The direct answer is D: the difference is 1. Write the comparison as (x²+8x+16)−(x²+8x+15). The common parts x² and 8x cancel, leaving 16−15=1. In an area model, both figures contain the same large x² region and the same combined strip area 8x. Only the corner pieces differ: one has area 16 and the other has area 15. Therefore the second model is larger by one square unit. A is wrong because 16 is the second corner itself, not the excess over 15. B and C are common strips present in both models, so they cannot create the difference. Memory cue: when comparing expressions, cancel identical terms before interpreting the remaining piece.

Related tags

Area ComparisonNear SquareVisual ModelPolynomial ExpressionsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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