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A grid has parts x², 9x, 2x, and 18. It can be viewed as a rectangle with which side lengths?

Answer and explanation

Correct answer: x + 9 and x + 2

The correct answer is C. In an area grid, the x² part must come from x × x. The 9x part can come from x × 9, and the 2x part can come from 2 × x. The remaining corner must then be 9 × 2 = 18. Therefore the two side lengths are x + 9 and x + 2, because (x + 9)(x + 2) = x² + 2x + 9x + 18. Option A would create different cross-products and a corner of 198, not 18. Option B would produce two 9x strips and a 81 corner. Option D would make an x × 18 strip and a corner 36, so it does not match the given regions. Memory cue: identify the two strip widths from the coefficients of x, then check that their product equals the constant corner.

Related tags

Area GridFactorisationRectangle ModelBinomial FactorsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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