SOLUTION: What is the Y coordinate of the vertex for the quadratic: y = x^2 -8x -9 Please show your work Thank you

Question 737763: What is the Y coordinate of the vertex for the quadratic: y = x^2 -8x -9
Please show your work
Thank you
Found 2 solutions by Susan-math, MathLover1:
Answer by Susan-math(40) (Show Source): You can put this solution on YOUR website!
Find
then substitute that for x to find the corresponding y:
So
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
..first write it in vertex form where and are and coordinates of vertex

...complete the square

so, and
coordinate of vertex is
see it on a graph:

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