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Visually, what is the difference between the areas of squares with sides (x+2) and (x+4)?

Answer and explanation

Correct answer: 4x+12

The direct answer is A. The larger square has area (x+4)² and the smaller has area (x+2)². Subtract: (x+4)²−(x+2)²=(x²+8x+16)−(x²+4x+4)=4x+12. The x² terms cancel because both squares contain the same central x-by-x part. B is only half of the correct difference and does not represent the full area change. C is the product (x+2)(x+4), not a subtraction of square areas. D keeps only the constant change and ignores the strips involving x. A useful visual cue is that enlarging a square from side x+2 to x+4 adds strips whose total area depends on x as well as the corner area.

Related tags

Algebraic IdentitiesArea DifferenceSquare ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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