17 - (-6) = 23
Therefore, the number you have to add to -6 to make 17 is 23.
Wiki User
∙ 13y agoYou need to add 12.
You need to add 6 - (-9) = 6 + 9 = 15.
6+17=23
17
17
17
You need to add 7 (or +7)
12
Add 11 -6 + 11 = 5
17
To complete the square of x^2 + 6x + 17, you need to add (6/2)^2 = 9 to the expression. This is because half of the coefficient of x is 6/2 = 3, and squaring that gives you 9. So the completed square is x^2 + 6x + 9 + 17 = (x + 3)^2 + 17.
- 8 + 17 = 9 =========