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Which expression can be arranged as a complete square in an algebra-tile model?

Answer and explanation

Correct answer: x²+10x+25

The direct answer is A: x²+10x+25. A trinomial is a perfect square when it has the form x²+2kx+k²=(x+k)². In option A, half of the middle coefficient 10 is 5, and 5²=25, exactly the constant term. Hence x²+10x+25=(x+5)². In an algebra-tile model, one x² tile, ten x-tiles, and twenty-five unit tiles can be arranged to make a square with side x+5. Option B fails because the constant would need to be 25, not 20. Option C fails because a middle coefficient of 5 would require a constant of (5/2)², not 25. Option D has no x-term, so it cannot form the indicated three-part square with side x plus a constant. Memory cue: halve the middle coefficient and square it; the result must equal the constant term.

Related tags

Algebra-TilesPerfect-Square-TrinomialVisual-ModelsAlgebra TilesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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