SOLUTION: how do you write y=x^2-18x in vertex form?

Algebra ->  College  -> Linear Algebra -> SOLUTION: how do you write y=x^2-18x in vertex form?      Log On


   

Question 519377: how do you write y=x^2-18x in vertex form?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
completing the square ___ y = x^2 - 18x + 81 - 81
___ added half of the x-term coefficient, squared
___ kept the value of the expression unchanged by adding the opposite value

vertex form ___ y = (x - 9)^2 - 81