Posted by Cynthia on .
I am having trouble with this problem. I have done it several times and come up with two different answers. Can someone tell me what I am doing wrong?
Write the quadratic function in the form a(xh)^2+k
y=x^22x9
(x^22x)9
(x^2+2x+11)9
(x^2+2x+1)
answers
(x+1)^2 or x^22x9=y

Algebra 
Anonymous,
I believe you are missing k. Remember y = x^22x9 and y = a(xh)^2+k. What you have gotten for y is (x+1)^2. If you expand it, you'll see that it is x^+2x+1 which is not equal to x^22x9. From your work which I believe is mostly correct but you made a tiny mistake. You pulled out 9 and 1, 10, from the original equation. That should be what you're missing. Even though you pulled them out they don't disappear into thin air ;/.

Algebra 
Cynthia,
So.....
from your answer I need to add a 10 to (x+1)^2+2x+10?