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In an area model, a positive tile of area 12x and a negative tile of area -5x are together. What is their combined linear area?

Answer and explanation

Correct answer: 7x

Correct answer: A, 7x. Signed tiles are added algebraically, so the combined area is 12x+(-5x). Because both terms are like terms, subtract their coefficients: 12-5=7, and keep the common factor x. Thus the result is 7x. The positive tile is larger in magnitude, so the final sign is positive. Option B, 17x, would result from adding 12 and 5 while ignoring the negative sign. Option C, -7x, reverses the sign even though the positive magnitude is greater. Option D multiplies the coefficients and also changes the expression into a quadratic term, which is not what addition of linear tiles does. Memory cue: opposite signed tiles cancel in pairs; after cancellation, the sign belongs to the tiles left over.

Related tags

Algebra-TilesSigned-TermsLike-TermsLinear-AreaAlgebra TilesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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