Answer
$x^2 + 6x$
Determine the coefficient of the x-term, which in this example is $6$. Half of $6$ is $3$, and $3^2$ is $9$.
Thus, add $9$ to both sides of the equation to complete the square:
$x^2 + 6x+9 = 0 + 9$
$(x +3)^2 = 9$
Work Step by Step
$x^2 + 6x$
Determine the coefficient of the x-term, which in this example is $6$. Half of $6$ is $3$, and $3^2$ is $9$.
Thus, add $9$ to both sides of the equation to complete the square:
$x^2 + 6x+9 = 0 + 9$
$(x +3)^2 = 9$
