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Which area model has outer side \((x+10)\) and small corner area \(100\)?

Answer and explanation

Correct answer: \((x+10)^2\)

Correct answer: A. The outer side is explicitly x+10, so the complete square has area (x+10)². In its area model, the small corner is formed by the 10-by-10 lengths, giving area 10²=100. Expanding the complete model would give x²+20x+100: one x² square, two 10x rectangles, and the 100 corner square. Option B has outer side x−10, not x+10. Option C is a difference of two square areas and does not describe the complete outer square. Option D is only the area of one mixed rectangle, 10 times x, not the whole model. Memory cue: the sign in the outer side controls the middle term, while the corner area is the square of 10.

Related tags

Outer SideCorner AreaSquare ModelVisual IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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