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If (x-4)(x+9) is expanded using a signed tile model, what constant corner is obtained?

Answer and explanation

Correct answer: -36

Correct answer: B, -36. In the signed area model, the constant corner is formed by multiplying the two constant side lengths. These constants are -4 and +9, so their product is (-4)(9)=-36. Therefore the corner consists of negative constant tiles with total value -36. The full expansion confirms this: (x-4)(x+9)=x^2+9x-4x-36=x^2+5x-36. Option A, 36, loses the negative sign. Options C and D come from adding or subtracting the constants, but a corner area is obtained by multiplication, not by addition. The x terms create the two linear regions, while the constant-by-constant product creates the constant corner. Memory cue: in (x+p)(x+q), the constant term is pq, including both signs.

Related tags

Algebra-TilesSigned-Tile-ModelConstant-TermBinomial MultiplicationAlgebra TilesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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