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In an area model, a rectangle is formed by (s+3) and (s+8). From what is the constant part formed?

Answer and explanation

Correct answer: 3×8

The direct answer is B: 3×8, which equals 24. The two side lengths are s+3 and s+8. In the area model, the constant region is the small corner where the two constant lengths meet. Its dimensions are 3 and 8, so its area is 3×8=24. The complete multiplication would be (s+3)(s+8)=s^2+8s+3s+24=s^2+11s+24. Option A adds the constants rather than finding the corner area. Option C describes a variable rectangle with area 3s, so it is not constant because it changes when s changes. Option D similarly has area 8s and also depends on s. Only B contains no variable and correctly uses multiplication, because area is length times breadth. Memory cue: in a binomial area model, the constant term comes from multiplying the two constant terms.

Related tags

Constant-TermArea-ModelBinomial-MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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