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In a square of side x + 6, what will be the total area of the two equal rectangles?

Answer and explanation

Correct answer: 12x

The correct answer is B: 12x. Imagine the square of side x + 6 divided into four parts: an x by x square, two equal rectangles, and a 6 by 6 square. Each of the two equal rectangles has one side x and the other side 6, so each area is x × 6 = 6x. Since there are two such rectangles, their total area is 6x + 6x = 12x. A gives the area of only one rectangle, not both. C multiplies 36 by x and does not describe either rectangle; 36 is the area of the small corner square. D is the area of the x by x square, not the combined rectangle area. The complete expansion is (x + 6)² = x² + 12x + 36, which confirms the middle term.

Related tags

Equal RectanglesBinomial SquareVisual Area ModelAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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