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In a square model, the side length is (x+1). What is its area?

Answer and explanation

Correct answer: x²+2x+1

The correct answer is B: x²+2x+1. The area of any square is side × side, or the square of its side. Here the side is x+1, so area = (x+1)(x+1) = (x+1)². Multiply each term in the first bracket by each term in the second bracket: x×x=x², x×1=x, 1×x=x, and 1×1=1. Adding these parts gives x²+x+x+1=x²+2x+1. In the visual model, x² is the large x-by-x square, and the two x terms are the two congruent rectangles. Option A misses the two x rectangles. Option C has only one x term, so it misses one rectangle. Option D is 2x+1 and does not include the main x² square. Remember: (x+1)² is not x²+1; the middle term 2x must be included.

Related tags

Square ModelArea IdentityVisual AlgebraBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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