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If the side of the big square is 10 and the side of the small square is 4, what is the area of the difference of squares?

Answer and explanation

Correct answer: 84

The direct answer is C, 84 square units. The area of a square is found by multiplying its side by itself, so the large square has area 10² = 100 square units. The small square has area 4² = 16 square units. The difference of their areas is therefore 100 − 16 = 84 square units. This is the identity a² − b² when a = 10 and b = 4. Option A, 40, is only 10 × 4 and does not represent the difference of the two square areas. Option B, 60, comes from 10² − 4, where the small side was not squared. Option C is correct because it subtracts both complete areas. Option D, 116, adds 100 and 16 instead of finding the difference. Remember: square both side lengths before subtracting.

Related tags

Difference Of SquaresArea Of SquaresAlgebraic IdentitiesVisual ModelsClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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