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In a rectangle model, into how many parts is (x+1)(x+4) most simply divided?

Answer and explanation

Correct answer: 4

The direct answer is B, 4 parts. A rectangle representing (x+1)(x+4) has one side split into two pieces, x and 1, and the other side split into two pieces, x and 4. A partition with two pieces in one direction and two in the other creates 2×2 = 4 smaller rectangles. Their areas are x×x = x², x×4 = 4x, 1×x = x, and 1×4 = 4. Together they explain the expansion x²+4x+x+4 = x²+5x+4. Option A, 2, counts only the pieces on one side and ignores the second split. Option B, 4, is correct because every piece from the first factor meets every piece from the second factor. Option C, 6, has no corresponding 2-by-2 grid structure. Option D, 8, doubles the required number and does not represent the simple rectangular partition. A useful method is to count factor parts, not algebraic terms: two parts times two parts gives four regions. Memory cue: for (two-term)(two-term), the basic grid has four cells.

Related tags

Grid ModelRectangle ProductVisual AlgebraBinomial MultiplicationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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