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What is obtained by adding all parts in the rectangle model of (4x+3)(x+2)?

Answer and explanation

Correct answer: (4x²+11x+6)

The direct answer is A: 4x²+11x+6. In a rectangle model, the total area equals the sum of the smaller rectangular areas. Split the sides into 4x and 3, and into x and 2. The four products are (4x)(x)=4x², (4x)(2)=8x, (3)(x)=3x, and (3)(2)=6. Adding them gives 4x²+8x+3x+6. Since 8x and 3x are like terms, they combine to 11x, giving 4x²+11x+6. B omits the 3x rectangle. C omits or miscomputes several products. D changes the leading coefficient 4 to 5. Memory cue: every term in one bracket must meet every term in the other bracket.

Related tags

Rectangle-ModelDistributive-PropertyExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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