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In an \((a+b)^2\) model, the sum of the \(a^2\) and \(b^2\) parts is 85, and the two rectangles together have area 84. What is the area of the whole square?

Answer and explanation

Correct answer: 169

The direct answer is A: 169. A square with side \(a+b\) is partitioned into four non-overlapping pieces: the square of area \(a^2\), the square of area \(b^2\), and two rectangles whose combined area is \(2ab\). The problem already gives the first two pieces together as 85 and the rectangular pieces together as 84. Since the whole area is the sum of all pieces, calculate \(85+84=169\). Option B, 1, is the difference between the given totals, not the area of the complete model. Option C counts only the two corner squares and leaves out the rectangles. Option D counts only the rectangles and leaves out the corner squares. The model uses addition because the pieces fill the square without overlap. Memory cue: total area of a partition equals the sum of every non-overlapping part.

Related tags

Area AdditionVisual Square ModelBinomial IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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