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A square model shows four parts: 4x², 6xy, 6xy, and 9y². What is the outer side?

Answer and explanation

Correct answer: 2x + 3y

The correct answer is A: 2x + 3y. In a square area model, the two pure-square parts tell us the two pieces of the side. Since 4x² = (2x)², one side piece is 2x. Since 9y² = (3y)², the other side piece is 3y. Therefore the complete outer side is 2x + 3y. We can check this by squaring: (2x + 3y)² = 4x² + 12xy + 9y². The two middle rectangles each have area 6xy, so together they give 12xy, exactly as shown. Option B does not produce the given square parts. Option C would give a different middle term and y² part. Option D has incorrect square pieces. Memory cue: identify the square roots of the corner squares, then add them.

Related tags

Area ModelPerfect SquareVisual IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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