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Write (x^2+6x+11) in completed square form.

Answer and explanation

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

Completed-square form rewrites a quadratic expression as a square of a binomial plus or minus a remaining constant. For an expression of the form \(x^2+bx+c\), take half of the coefficient of x, square it, and use that value to create the perfect square. The added amount must then be balanced so that the original expression remains unchanged.

Here, half of 6 is 3, and \(x^2+6x+9=(x+3)^2\). Since the original constant is 11, split it as \(11=9+2\). Therefore, \(x^2+6x+11=(x+3)^2+2\), which is option A. The plus sign inside the bracket is needed because the middle term is positive. Option D has the wrong remaining constant, while options B and C do not correctly reproduce the original expression.

Related tags

Quadratic ExpressionsCompleting SquareIdentity

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