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Which visual model can immediately connect x²+2xy+y²−z² with (x+y−z)(x+y+z)?

Answer and explanation

Correct answer: Removing a square of side z from a square of side x+y

Direct answer: Option A is correct. The first three terms form a perfect square: x²+2xy+y²=(x+y)². Therefore the complete expression is (x+y)²−z². This is a difference of two squares, represented visually by starting with a square of side x+y and removing a smaller square of side z. Applying u²−v²=(u−v)(u+v), with u=x+y and v=z, gives (x+y−z)(x+y+z). Option B begins with (x−y)², which has a negative 2xy term. Option C contains too few regions to represent x²+2xy+y²−z². Option D makes a larger square and would introduce additional positive terms instead of subtracting z². The reliable sequence is: identify the perfect square, represent subtraction by removing a square, then use the difference-of-squares identity.

Related tags

Difference Of SquaresCombined IdentityVisual FactorisationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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