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In a rectangle model, the length is (x+6) and the breadth is x. What is the area?

Answer and explanation

Correct answer: x²+6x

Direct answer: D, x²+6x. The area of a rectangle is length multiplied by breadth. Here the area is (x+6)×x. Use the distributive property: x(x+6)=x·x+x·6=x²+6x. In the area model, the x-by-x region contributes x² and the 6-by-x region contributes 6x; adding them gives x²+6x. A is wrong because the 6 must also be multiplied by x. B multiplies incorrectly and gives an x² term with coefficient 6. C is not the correct distributive expansion and does not represent the product of the two dimensions. D matches both the geometry and the algebra. A helpful check is to substitute x=1: the rectangle has dimensions 7 and 1, so its area is 7; D gives 1+6=7.

Related tags

Rectangle AreaDistributive PropertyVisual MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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