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Which perfect square equals (x^2+12x+36)?

Answer and explanation

Correct answer: ((x+6)^2)

A perfect square trinomial has the pattern \(a^2+2ab+b^2=(a+b)^2\). In the given expression, the first term is \(x^2\), the last term is 36, and \(36=6^2\). The middle term should then be \(2\cdot x\cdot6=12x\), which is exactly the term present. This confirms that the expression is the square of \(x+6\).

Therefore \(x^2+12x+36=(x+6)^2\), so option C is correct. Expanding it gives \((x+6)(x+6)=x^2+6x+6x+36=x^2+12x+36\). Option B would produce a negative middle term, while A and D give middle coefficients 24 and 6 respectively. Checking the last term and the middle term together prevents such errors.

Related tags

Quadratic ExpressionsPerfect SquareIdentity

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