What did I do wrong?
Identify the vertex
$$y=2x^2-4x-2$$$$=2(x^2-2x-1)$$$$=2(x-1)^2$$
h=1
k=0
but according to my answers $$(h,k)\cancel{=}(1,0)$$

Question

anonymous · Answer

@zepdrix

jim_thompson5910 · Answer

x^2-2x-1 does NOT factor to (x-1)^2

jim_thompson5910 · Answer

Notice this

(x-1)^2 = (x-1)(x-1)

(x-1)^2 = x(x-1)-1(x-1)

(x-1)^2 = x^2 - x - x + 1

(x-1)^2 = x^2 - 2x + 1

jim_thompson5910 · Answer

So if it was x^2 - 2x + 1, then it would factor to (x-1)^2

anonymous · Answer

Completing the square?

jim_thompson5910 · Answer

yes you need to complete the square for x^2-2x-1

anonymous · Answer

I have a random question...I think I lost an excel document I worked very hard on. I stored it on my usb...Is that possible?

jim_thompson5910 · Answer

its possible, and if you lost it you can search for it or you may be able to recover it if you deleted it on accident

anonymous · Answer

how?

jim_thompson5910 · Answer

do a search for *.xls files

jim_thompson5910 · Answer

that will list all the excel documents on your computer

anonymous · Answer

I have an outdated version of the stuff I worked on...It has a copy of 1/13/2013
I did so much more work on it since then...Oh well...Ok back to completing the square

jim_thompson5910 · Answer

if you do that search, and that file exists somewhere, then you'll find it

anonymous · Answer

I worked on it on a computer at work, and the computer there give me a warning stating that it had protected information and wouldn't allow me to save it on my usb drive...I disregarded that message...do you think the computer would remove it from my usb?

anonymous · Answer

*gave me warning

jim_thompson5910 · Answer

well if it said it couldn't save, then chances are that it never saved it in the first place

anonymous · Answer

oh I see...would it still be on that computer tomorrow?

jim_thompson5910 · Answer

so it was probably all in memory (ie RAM) the whole time

jim_thompson5910 · Answer

not if it only existed in RAM only

jim_thompson5910 · Answer

although, there might be a chance it's on your work computer somewhere in temp file maybe

anonymous · Answer

yeah I hope so...I didn't shut the computer down.

jim_thompson5910 · Answer

oh is the file/program still running?

anonymous · Answer

well I closed that (x-ed out of it) I'm such a noob when it comes to computer programs haha

jim_thompson5910 · Answer

then chances are the data is gone because memory that is deallocated is given to another open program

anonymous · Answer

sigh....
<- sad koala....

how about a little completing the square exercise

jim_thompson5910 · Answer

2x^2-4x-2


2(x^2-2x-1)


2(x^2-2x + 1 - 1 -1)


2((x^2-2x + 1) - 1 -1)


2((x-1)^2 - 2)


2(x-1)^2 - 4


Vertex: (1,-4)

anonymous · Answer

I recreated what I made at work. I saved it on my laptop this time!

jim_thompson5910 · Answer

sounds good, hopefully it didn't take too long to recreate