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What is the difference between the area models of squares (x+5) and (x+1)?

Answer and explanation

Correct answer: 8x+24

The correct answer is A: 8x+24. The two square areas are (x+5)^2 and (x+1)^2, so their difference is (x+5)^2-(x+1)^2. This is a difference of squares. Let P=x+5 and Q=x+1. Using P^2-Q^2=(P+Q)(P-Q), we get [(x+5)+(x+1)] [(x+5)-(x+1)]=(2x+6)(4)=8x+24. The same result can be checked by expansion: (x+5)^2=x^2+10x+25 and (x+1)^2=x^2+2x+1. Subtracting gives x^2+10x+25-x^2-2x-1=8x+24. Option B incorrectly handles the multiplication by 4 and gives the wrong coefficient of x. Option C does not come from either correct factoring or expansion. Option D combines terms as though the two areas should be added, rather than finding their difference. Thus A is the only consistent answer. Memory cue: the difference of two square areas equals the sum of their side expressions multiplied by their difference.

Related tags

Difference-Of-SquaresArea-Of-SquaresVisual-ModelAlgebraic-IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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