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If (x^2+10x+25) is made as a complete square using tiles, what is the area of each of the two equal rectangles?

Answer and explanation

Correct answer: (5x)

Direct answer: D, 5x. Compare the expression with (x+5)^2=x^2+2(5)x+25=x^2+10x+25. In the tile model, the x^2 tile and the 25 tile are the two square pieces. The middle term 10x is made from two equal rectangles, so each rectangle must have half of that total area: 10x÷2=5x. Equivalently, each rectangle has dimensions x and 5, giving area 5x. Option A assigns the whole middle term to each rectangle and would incorrectly produce 20x in total. Option B confuses the constant square area 25 with a rectangle area. Option C does not account for the coefficient 5 required by the side length. Option D correctly matches both the identity and the tile dimensions. A useful habit is to split the middle term into two equal parts before identifying the rectangles: 10x=(5x)+(5x).

Related tags

Complete SquareAlgebra TilesMiddle TermVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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