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If a square model of (x+12)^2 contains the regions x^2 and 144, what missing part completes the model?

Answer and explanation

Correct answer: A combined strip area of 24x

Correct answer: C, a combined strip area of 24x. The square has side x+12, so its total area is (x+12)^2=x^2+2(x)(12)+12^2=x^2+24x+144. The x^2 region is already present, and the corner of area 144 is present because 12^2=144. The remaining two rectangles each have dimensions x and 12, so each has area 12x. Together they contribute 12x+12x=24x. Option A gives only one of the two equal strips and leaves the model incomplete. Option B incorrectly multiplies 12 and 12x and has the wrong degree and coefficient. Option D repeats existing regions rather than supplying the missing middle part. Memory cue: for (p+q)^2, the two side rectangles always combine to 2pq.

Related tags

Binomial-SquareVisual-ModelMiddle-TermArea-ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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