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Write (x^2+6x+9) as a perfect square.

Answer and explanation

Correct answer: ((x+3)^2)

A perfect square is an expression formed by multiplying a binomial by itself. The identity \((a+b)^2=a^2+2ab+b^2\) helps us recognize it. Here the first term is \(x^2\), so one part is \(x\); the constant term is 9, whose square root is 3. Therefore the matching form must involve \(x+3\), not \(x-3\) or a larger constant.

Expanding \(\left(x+3\right)^2\) gives \(x^2+2\cdot x\cdot3+3^2=x^2+6x+9\). Both the middle term and the final term match exactly, so option A is correct. Option B would produce \(x^2-6x+9\), while options C and D give incorrect middle and constant terms. Thus the given expression is \(\left(x+3\right)^2\).

Related tags

Quadratic ExpressionsPerfect SquareIdentity

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