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A rectangle has sides (x+3) and (x+8). What will be the constant corner in the area model?

Answer and explanation

Correct answer: 24 / product of constants

The direct answer is option B: 24. The area of the rectangle is (x+3)(x+8). In an area grid, multiply every part of the first side by every part of the second side: x·x gives x^2, x·8 gives 8x, 3·x gives 3x, and 3·8 gives 24. The small corner uses the two constant lengths, 3 and 8, so its area is their product, 3×8=24. Option A is 3+8=11, the sum, not the corner area. Option B is correct because a rectangle’s area is length times breadth. Option C is 8−3=5, the difference, which has no role here. Option D represents the two variable strips, 3x+8x=11x, so it is not constant. The complete expansion is x^2+11x+24. Memory cue: constant corner means constant times constant.

Related tags

Constant CornerRectangle ModelArea GridVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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