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If the total area of a square model is x²+2x+1, what will be its side?

Answer and explanation

Correct answer: x+1

The direct answer is A: x+1. A square’s area is the square of its side, so we need to recognise x²+2x+1 as a perfect square. Using (a+b)²=a²+2ab+b² with a=x and b=1 gives (x+1)²=x²+2x+1. Thus the side is x+1. In the visual model, the parts are an x by x square, two x by 1 rectangles, and a 1 by 1 square. Option B gives (x+2)²=x²+4x+4, so its middle and constant terms are wrong. Option C gives (x−1)²=x²−2x+1, with the wrong sign for the middle term. Option D gives (2x+1)²=4x²+4x+1, so even the leading term is wrong. Memory cue: x²+2x+1 is the standard pattern x²+2(x)(1)+1².

Related tags

Perfect-SquareSide-IdentificationVisual-TilesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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