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A rectangle with sides (m+2) and (m+8) shows which expression in an area model?

Answer and explanation

Correct answer: m²+10m+16

The direct answer is B, m²+10m+16. The area of the rectangle is the product (m+2)(m+8). Split the sides into m and 2, and m and 8. The four area regions are m·m=m², m·8=8m, 2·m=2m, and 2·8=16. Adding them gives m²+8m+2m+16=m²+10m+16. Option A is wrong because 16 is the product of the constants and must be a constant term; it cannot become 16m. Option C incorrectly combines the variable terms as 8m−2m instead of 8m+2m. Option D has a negative constant, but both constant side lengths are positive, so 2·8=+16. The area model is simply the distributive property shown as four smaller rectangles. A useful rule is (m+r)(m+s)=m²+(r+s)m+rs; here r=2 and s=8, so the result is m²+10m+16.

Related tags

Rectangle ModelBinomial ProductArea ExpansionDistributive PropertyVisual Models Of IdentitiesClass 9 MathematicsExploring Algebraic IdentitiesMathematics

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