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If the tile model (x^2+10x+c) forms a square with side (x+5), what is c?

Answer and explanation

Correct answer: 25

The direct answer is D: 25. A square with side x+5 has area (x+5)^2. Using the square identity, (x+5)^2=x^2+2·x·5+5^2=x^2+10x+25. Compare this with x^2+10x+c: the matching constant term is c=25. In a tile model, x^2 is the large square, two 5x rectangles together make 10x, and the remaining corner is a 5 by 5 square with area 25. A is the coefficient of x, not the constant corner. B and C do not result from squaring the constant part. D is correct because the last tile is 5^2. Memory cue: for x^2+2kx+k^2, the missing constant is k^2; do not confuse 2k with k^2.

Related tags

Algebra TilesComplete SquareQuadratic ExpressionExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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