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In which model can a \(b^2\) square be removed from a corner of an \(a^2\) square and the remaining part rearranged into a rectangle?

Answer and explanation

Correct answer: \(a^2-b^2=(a+b)(a-b)\)

The direct answer is option A. A square with side \(a\) has area \(a^2\), and a square with side \(b\) has area \(b^2\). If the smaller square is removed from the larger one, the remaining area is \(a^2-b^2\). In the visual rearrangement, the remaining pieces can be joined to make a rectangle whose side lengths are \(a+b\) and \(a-b\). Its area is therefore \((a+b)(a-b)\), proving the difference-of-squares identity. Option B is wrong because \((a+b)^2=a^2+2ab+b^2\), so it contains an extra \(2ab\). Option C is wrong because \((a-b)^2=a^2-2ab+b^2\), not the expression shown. Option D is not a valid general area identity. Memory cue: removing one square from another means subtracting squares; rearrangement gives the two factors.

Related tags

Difference Of SquaresVisual ProofRearrangementAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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