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In the square model of (2x+1)², what is the area of the larger square?

Answer and explanation

Correct answer: 4x²

The correct answer is B, 4x². In the square model of (2x+1)², the larger component square has side length 2x. The area of a square is side × side, so its area is (2x)² = (2x)(2x) = 4x². Option A, 2x², squares x but forgets to square the coefficient 2. Option C, x², would be the area of a square with side x, not side 2x. Option D, 2x, is only the side length of the larger square, not its area. The complete identity is (2x+1)² = 4x²+4x+1, where the other pieces are two rectangles of area 2x each and a 1-by-1 square. Memory cue: when a whole term is the side of a square, every factor in that term must be squared: (2x)² = 2²x² = 4x².

Related tags

Algebraic IdentitiesVisual ModelsArea Of SquareBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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