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In the rectangle model of (x+2)(x+4), what is the area of the constant part?

Answer and explanation

Correct answer: 8

The correct answer is D, 8. In the rectangle model, one side is split into x and 2, and the other side is split into x and 4. The constant part is the small region formed by the two numerical lengths, 2 and 4; it contains no x. Its area is therefore 2 × 4 = 8. Expanding the product confirms this: (x+2)(x+4) = x²+4x+2x+8 = x²+6x+8. Option A is only the numerical length 2, not an area. Option B is only the numerical length 4. Option C comes from adding 2+4 and is the coefficient of x in the middle term 6x, not the constant area. Option D correctly multiplies the two constant side lengths. Memory cue: in a rectangle model, the constant term is the corner formed by multiplying the two number-only parts.

Related tags

Algebraic IdentitiesRectangle ModelConstant TermArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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