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Which visual partition correctly represents (m+7)²?

Answer and explanation

Correct answer: m², 7m, 7m, 49; correct partition

The direct answer is option C. Imagine a square whose side is m+7 and divide each side into lengths m and 7. The resulting large square contains one m by m square with area m², two rectangles with dimensions m by 7 and area 7m each, and one 7 by 7 corner square with area 49. Therefore the complete partition is m²+7m+7m+49=m²+14m+49, which is exactly (m+7)². Option A has only one 7m rectangle, so one strip is missing and it gives an incomplete area. Option B combines the two middle rectangles as 14m but then lists 49 twice, adding an extra corner; there is only one 7 by 7 corner. Option D uses incorrect dimensions and gives 49m instead of the required strip area 7m. A useful check is the identity (a+b)²=a²+2ab+b²: the middle contribution must be 2m×7=14m.

Related tags

Visual PartitionSquare ModelBinomial IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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