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In a grid model, the rows are x and 5, and the columns are x and 2. What will be the total area?

Answer and explanation

Correct answer: x^2+7x+10 / correct total

The direct answer is option A: x^2+7x+10. Multiply each row label by each column label. The four cells are x·x=x^2, x·2=2x, 5·x=5x, and 5·2=10. Adding them gives x^2+2x+5x+10=x^2+7x+10. Option A includes every cell and combines the two middle terms correctly. Option B has the coefficients and constant in the wrong places; 10 is the product of the constants and must be the constant term. Option C includes only one variable strip and omits the other strip and the corner. Option D uses a negative middle term even though all row and column labels are positive. The model is the distributive property in picture form. Memory cue: fill all four cells before collecting like terms.

Related tags

Grid ModelRectangle AreaDistributive PropertyVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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