anonymous
  • anonymous
find the axis of symmetry for this parabola y=-5x^2-10x-13
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
write the answer as an equation
IrishBoy123
  • IrishBoy123
complete the square \(y=-5x^2-10x-13\) might be easier to do it starting with this \(y=-5[x^2+2x+\frac{13}{5}]\)
anonymous
  • anonymous
-1?

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More answers

IrishBoy123
  • IrishBoy123
\(\large \checkmark\)
anonymous
  • anonymous
It's not that
IrishBoy123
  • IrishBoy123
it is x = -1 if you copied the question correctly
1 Attachment
anonymous
  • anonymous
I copied the question right but -1 wasn't the answer
anonymous
  • anonymous
try this one y=-x^2+6x-8
Loser66
  • Loser66
@Kaelyn78 you want us do your homework, don't you?
IrishBoy123
  • IrishBoy123
you could do that one in your head!
anonymous
  • anonymous
these are practice problems, not homework
anonymous
  • anonymous
this paper is not graded
anonymous
  • anonymous
and no I can't, I don't know how to find the axis of symmetry in my head
IrishBoy123
  • IrishBoy123
we still haven't finished the first one if the answer is not x = -1, what is it?!
anonymous
  • anonymous
I don't know, that's why I posted it here.
anonymous
  • anonymous
1 or -1
Loser66
  • Loser66
The first one, @IrishBoy123 showed you all the steps + proof. You said it is not the right answer without any reason. I am with him and don't get why you go to other one without finish the first one. :)
IrishBoy123
  • IrishBoy123
do it another way \(y=-5x^2-10x-13\) \(y' = -10 x - 10\) \(y' = 0 \implies x = -1\)
anonymous
  • anonymous
because I entered that answer into the computer and it said it isn't right
Astrophysics
  • Astrophysics
Irish boy is right!
anonymous
  • anonymous
Computers don't lie, and they don't give you an explanation of why it's wrong
anonymous
  • anonymous
I came to the same conclusion he had, I agree with him, but the computer doesn't.
Astrophysics
  • Astrophysics
You can check another way by finding the vertex, \[x= -\frac{ b }{ 2a }\]
Astrophysics
  • Astrophysics
\[x = - \frac{ (-10) }{ 2(-5) } = -1\]
anonymous
  • anonymous
Guys they don't give you an option to do the problem a second time. I entered the answer and it was wrong so I just have to move on to the next question. Proving it to me over and over again will not change anything.
anonymous
  • anonymous
If you ever meet the developers of the program I'm working with you can argue with them about that. Thank you all for your help on that problem.
IrishBoy123
  • IrishBoy123
put each new question in a new thread and let's see if we can sort out that pesky computer of yours. perhaps you should wire it to a lie detector :p
Astrophysics
  • Astrophysics
lool
anonymous
  • anonymous
That would be great... Technology is great when it works, horrible when it doesn't

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