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In which visual proof is a² + 2ab + b² seen as one large square?

Answer and explanation

Correct answer: A square with side a + b

Direct answer: A. A large square with side a + b has area (a + b)². Divide each side into parts a and b. The figure then contains an a by a square of area a², a b by a rectangle of area ab, another equal rectangle of area ab, and a b by b square of area b². Adding the four parts gives a² + ab + ab + b² = a² + 2ab + b². Thus the entire collection is one large square whose side is a + b. Option A matches the outer shape and the identity. Option B gives (a − b)² = a² − 2ab + b², so its middle term is negative. Option C gives (a + b)(a − b) = a² − b², which is a difference of squares. Option D has area ab only, not the full expression. Memory cue: the plus-plus square identity corresponds to the outside side a + b.

Related tags

Sum Of Squares IdentityVisual ProofArea ModelPerfect SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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