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How can (x^2+4x+7) be written as a perfect square plus a constant?

Answer and explanation

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

Completing the square means changing a quadratic expression into a square of a binomial plus or minus a remaining constant. For an expression beginning with \(x^2+bx\), take half of the coefficient of x, square it, and add and subtract that same value. This keeps the value unchanged while creating a perfect square.

The coefficient of x is 4. Half of 4 is 2, and its square is 4. Therefore, \(x^2+4x+7=x^2+4x+4+3=(x+2)^2+3\). The added 4 forms the square, while subtracting it from 7 leaves 3. Hence option A is correct. Expanding \((x+2)^2+3=x^2+4x+4+3=x^2+4x+7\) verifies the result.

Related tags

Completing SquareQuadratic ExpressionStandard Form

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