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In the rectangle model of (x+1)(x+6), what is the total x-term?

Answer and explanation

Correct answer: 7x

Direct answer: B, 7x. Make a rectangle with side partitions x and 1 in one direction and x and 6 in the other. The four areas are x·x=x², x·6=6x, 1·x=x, and 1·6=6. The two terms containing x are like terms, so combine them: 6x+x=7x. A is only the area of one rectangle and ignores the x by 1 part. B combines both linear regions correctly. C counts only the smaller linear region and omits 6x. D is not produced by the model; subtracting 6x and x would be inappropriate because both regions are positive and are being added. The full expansion is x²+7x+6. Memory cue: in (x+p)(x+q), the total x-term is (p+q)x.

Related tags

Rectangle-ModelLike-TermsBinomial-MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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