What number must you add to complete the square? x^2+6x=23

9

Step-by-step explanation:

using the formula (b/2) ^2 you will divide 6 by 2 and square it. you will get 9. if you add 9 to the left side, you would have to add it on the right side as well (23+9=32). your answer should look like x^2+6x+9=32