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In the rectangle model of (x+3)(x+8), which is the correct group of four parts?

Answer and explanation

Correct answer: x^2, 3x, 8x, 24

The correct answer is A. A rectangle for (x+3)(x+8) is divided according to the two terms in each factor. Multiply each part of the first factor by each part of the second: x times x gives x^2; x times 8 gives 8x; 3 times x gives 3x; and 3 times 8 gives 24. These are the four regions in the visual model, and their sum is x^2+8x+3x+24=x^2+11x+24. Option B incorrectly combines terms and also changes the constant to 1. Option C treats 3x as 3x^2, although only one factor contains x in that product. Option D places incorrect coefficients and degrees in the regions. A useful check is that every part must come from one term on the first side and one term on the second side.

Related tags

Rectangle-ExpansionFour-PartsVisual-MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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