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A visual model shows x² + 6x + 5 and x² + 6x + 9. How much greater is the second expression than the first?

Answer and explanation

Correct answer: 4, the difference of the constant parts

The correct answer is 4. To compare the two expressions, subtract the first expression from the second: (x² + 6x + 9) − (x² + 6x + 5). Remove the brackets carefully: x² + 6x + 9 − x² − 6x − 5. The x² terms cancel, and the 6x terms also cancel because they are common to both models. Only the constants remain, so 9 − 5 = 4. Therefore, the second model has four more square units than the first, provided the visual model represents these algebraic areas. Option A is wrong because 6x is a common middle part, not the increase. Option B is only the first constant part. Option D is only the second constant part, not the difference. A useful memory cue is: when two expressions have the same variable terms, compare only the terms that changed.

Related tags

Area ComparisonVisual ModelConstant DifferenceAlgebraic ExpressionsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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