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In a rectangle model, x(x+6) is shown by which sum?

Answer and explanation

Correct answer: x^2+6x

The direct answer is B: x^2+6x. Think of x(x+6) as the area of a rectangle with one side x and the other side x+6. Split the second side into lengths x and 6. The original rectangle is then divided into two smaller rectangles. The first has dimensions x by x, so its area is x^2. The second has dimensions x by 6, so its area is 6x. Adding the two parts gives x^2+6x, which is the distributive property x(x+6)=x·x+x·6. A, x^2+36, incorrectly treats 6 as if it were multiplied by itself; the second part should be 6x. C changes the terms and gives the wrong degree and coefficients. D is only the total side length x+6, not an area, because it lacks multiplication by the other side x. B is confirmed by a quick expansion and by the rectangle picture. Memory cue: split a side, then multiply the unchanged side by each piece; areas add.

Related tags

Distributive AreaRectangle ModelAlgebraVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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