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In the rectangle model of (x+1)(x+4), what is the total of the x-terms?

Answer and explanation

Correct answer: 5x

The direct answer is C, 5x. Use the rectangle model or distribute each term: (x+1)(x+4) produces x·x = x², x·4 = 4x, 1·x = x, and 1·4 = 4. The two terms containing exactly one x are 4x and x. They are like terms because both have x to the first power, so their coefficients can be added: 4x+x = 5x. Thus the full expansion is x²+5x+4. Option A, 4x, is only the area of one mixed rectangle and leaves out the other x-term. Option B, x, is the other mixed rectangle alone. Option C correctly combines both mixed regions. Option D, 6x, adds the constants 4 and 1 to the coefficient incorrectly; constants are not x-terms. The important rule is to combine only like terms: 4x and x can combine, but x² and x cannot, and 4 cannot combine with them. Memory cue: in a two-by-two product grid, add the two off-diagonal rectangles to obtain the middle term.

Related tags

Algebraic IdentitiesRectangle ModelBinomial MultiplicationLike TermsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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