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An \(x\) by \(x\) square, two \(x\) by \(5\) rectangles, and one \(5\) by \(5\) square are combined. This is a model of what?

Answer and explanation

Correct answer: \((x+5)^2\)

Direct answer: option D, \((x+5)^2\). Find the area of each piece. The \(x\) by \(x\) square has area \(x^2\). Each \(x\) by \(5\) rectangle has area \(5x\), so the two rectangles together have area \(10x\). The \(5\) by \(5\) square has area \(25"). Adding gives \(x^2+10x+25\). By the identity \(a^2+2ab+b^2=(a+b)^2\), with \(a=x\) and \(b=5\), this becomes \((x+5)^2\). Option A has a negative middle term and would require subtracting the two rectangles, which is not what the combined positive pieces show. Option B is a difference of squares and has no middle term. Option C contains only \(5x\), but the two rectangles contribute \(5x+5x=10x\), so it is incomplete. Memory cue: two positive equal rectangles create the \(+2ab\) term.

Related tags

Algebraic IdentitiesAlgebra TilesVisual ModelsSquare ExpansionVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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