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A rectangle has an x^2 square, 6x and 4x strips, and a 24 corner. What are its sides?

Answer and explanation

Correct answer: x+6 and x+4

The direct answer is A: the sides are x+6 and x+4. In an area model, the x^2 tile comes from x·x. A strip of area 6x is formed by x·6, so one side contributes the constant part 6. Similarly, the 4x strip comes from x·4, giving the other side constant part 4. Thus the dimensions are (x+6) and (x+4). Their product verifies the model: (x+6)(x+4)=x^2+4x+6x+24=x^2+10x+24. Option B incorrectly uses the sum 6+4=10 as one side and 24 as the other constant, confusing the middle and final terms. Option C has constants whose product is 24, but its strips would be 2x and 12x, not 6x and 4x. Option D gives negative strips and does not match the positive model. Memory cue: each x-strip directly reveals one added constant in a factor.

Related tags

Algebraic IdentitiesFactor ModelVisual TilesFactorisationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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