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If the total area of a square with side (a + b) is a^2 + 2ab + b^2, where does the a^2 part come from?

Answer and explanation

Correct answer: From a square of side a

The correct answer is A: the square with side a. Divide the large square of side a+b into four parts by drawing one line after length a and another after width a. One part is a square with length a and breadth a, so its area is a × a = a^2. Another part is a square of side b with area b^2. The remaining two parts are rectangles with dimensions a and b, each having area ab; together they give 2ab. Option A identifies the source of a^2 exactly. Option B gives b^2, not a^2. Option C gives the middle term 2ab, not the first square term. Option D refers to boundary length, whereas a^2 is an area and cannot come directly from the perimeter. This partition is the visual proof of (a+b)^2 = a^2 + 2ab + b^2. Memory cue: each squared term comes from a small square; the mixed term comes from the two rectangles.

Related tags

Visual ProofArea PartitionBinomial SquareAlgebraic IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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