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In a grid, the columns are (x) and (2), and the rows are (3x) and (−5). What total area is formed?

Answer and explanation

Correct answer: 3x²+x−10, signed sum

The direct answer is A. Multiply each row label by each column label to obtain the four signed cells. The products are 3x·x=3x², 3x·2=6x, (−5)·x=−5x, and (−5)·2=−10. Add them with their signs: 3x²+6x−5x−10=3x²+x−10. B incorrectly adds the middle terms as 6x+5x instead of recognising that −5x is negative. C pairs the labels incorrectly and does not represent the grid cells. D omits both middle cells, even though they are essential to the total. In a signed area model, negative tiles are algebraic contributions; they are not simply ignored. Memory cue: fill every cell first, attach its sign, then combine like terms.

Related tags

Signed GridArea ModelCell MultiplicationAlgebraic ExpressionsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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