# Algebra

posted by .

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(x-h)^2+k

y=x^2-2x-9
(x^2-2x)-9
(x^2+2x+1-1)-9
(x^2+2x+1)
(x+1)^2 or x^2-2x-9=y

• Algebra -

I believe you are missing k. Remember y = x^2-2x-9 and y = a(x-h)^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^2-2x-9. 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 -

So.....

## Similar Questions

1. ### algebra

Solve the quadratic equation: 2x(squared)+6x+12=0 I know you have to find two numbers that =24 (2 times 12) and have a sum of 6. But I can't think of any! Can someone please help?
2. ### algebra

could you please multiply these together and tell me what you come up with..im having trouble coming up with the right answer...im doing something wrong but don't know what!! (-.096t^4+3t^3-27t^2+91t+1700)*(.043t+49)
3. ### Algebra HELP!

I cannot find an example and am confused about what to do with this problem. Can someone tell me what they want?
4. ### Math

I am having trouble figuring the appropriate expression for this problem ... i have to determine what "t" = if the following ... 7 and 35 ... 6 and 40 ... and 9 and 45 .... The 6 and 40 are throwing me off .. only connection i can …
5. ### Algergra

I am stumped! I have been working on these problems for the longest time and I can not figure out what I am doing wrong. Some how when I get to the last two steps I mess up, and I am beyond frustrated. The directions say: Write an …
6. ### algebra2

Write the expression (2x)(4y) + 9x + 10y + (8x)(4y) in a simpler form, if possible. I've tried this problem several times, and have gotten the wrong answer. Someone help?
7. ### algebra

You throw a rock off the balcony overlooking your backyard the table shows the height of the rock at different times use quadratic regressin to find a quadratic model for this data. time 0 1 2 3 4 5 height 24 44.2 54.8 55.8 47.2 29 …
8. ### Algebra

I have an assignment to write an equation to point-slope form, then to standard form, and then to slope-intercept form. I have used the points (-2,-1) or (1,2), but I used (-2,-1). Now, I have the point-slope form of y + 1= 1(x + 2) …