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A square model shows \(c^2-12c+36\). What is the side length of the square?

Answer and explanation

Correct answer: \(c-6\)

The correct answer is B: \(c-6\). Compare the expression with the identity \((a-b)^2=a^2-2ab+b^2\). The first term \(c^2\) shows that \(a=c\). The constant term 36 is \(6^2\), so the fixed part is 6. The middle term should then be \(-2(c)(6)=-12c\), exactly as given. Therefore, \(c^2-12c+36=(c-6)^2\), and the side of the square is \(c-6\). Option A gives \((c+6)^2=c^2+12c+36\), with the wrong sign in the middle. Option C gives \((c-12)^2=c^2-24c+144\), so both the middle and constant terms are wrong. Option D gives \((c+12)^2=c^2+24c+144\), which is also incorrect. The negative middle term is the visual clue that the fixed length is subtracted. Also, the square root of the constant term gives the magnitude 6, not 12.

Related tags

Perfect-Square IdentityVisual Square ModelNegative Middle TermSide LengthVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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