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In signed rectangle tiles for (x+4) and (x-2), what will be the total area of the x-tiles?

Answer and explanation

Correct answer: 2x

The direct answer is A: the total area of the x-tiles is 2x. Multiply the two signed binomials by arranging their tile regions: (x+4)(x-2)=x·x+x·(-2)+4·x+4·(-2)=x^2-2x+4x-8. The two regions containing exactly one x factor are -2x and +4x. Combine their signed areas: -2x+4x=2x. Thus the x-tiles together represent 2x. B, 6x, adds the magnitudes 2x and 4x while ignoring the negative sign. C, -2x, counts only the x by -2 tile and leaves out the +4x tile. D, -8x, incorrectly treats the constant region 4·(-2)=-8 as an x-region. Signed tiles require the signs to be preserved. Memory cue: collect like tiles only after writing each sign and coefficient.

Related tags

Signed-TilesLinear-TermsRectangle-AreaAlgebra TilesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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