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anonymous

  • one year ago

find the axis of symmetry for this parabola y=-5x^2-10x-13

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  1. anonymous
    • one year ago
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    write the answer as an equation

  2. IrishBoy123
    • one year ago
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    complete the square \(y=-5x^2-10x-13\) might be easier to do it starting with this \(y=-5[x^2+2x+\frac{13}{5}]\)

  3. anonymous
    • one year ago
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    -1?

  4. IrishBoy123
    • one year ago
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    \(\large \checkmark\)

  5. anonymous
    • one year ago
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    It's not that

  6. IrishBoy123
    • one year ago
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    it is x = -1 if you copied the question correctly

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  7. anonymous
    • one year ago
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    I copied the question right but -1 wasn't the answer

  8. anonymous
    • one year ago
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    try this one y=-x^2+6x-8

  9. Loser66
    • one year ago
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    @Kaelyn78 you want us do your homework, don't you?

  10. IrishBoy123
    • one year ago
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    you could do that one in your head!

  11. anonymous
    • one year ago
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    these are practice problems, not homework

  12. anonymous
    • one year ago
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    this paper is not graded

  13. anonymous
    • one year ago
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    and no I can't, I don't know how to find the axis of symmetry in my head

  14. IrishBoy123
    • one year ago
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    we still haven't finished the first one if the answer is not x = -1, what is it?!

  15. anonymous
    • one year ago
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    I don't know, that's why I posted it here.

  16. anonymous
    • one year ago
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    1 or -1

  17. Loser66
    • one year ago
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    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. :)

  18. IrishBoy123
    • one year ago
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    do it another way \(y=-5x^2-10x-13\) \(y' = -10 x - 10\) \(y' = 0 \implies x = -1\)

  19. anonymous
    • one year ago
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    because I entered that answer into the computer and it said it isn't right

  20. Astrophysics
    • one year ago
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    Irish boy is right!

  21. anonymous
    • one year ago
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    Computers don't lie, and they don't give you an explanation of why it's wrong

  22. anonymous
    • one year ago
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    I came to the same conclusion he had, I agree with him, but the computer doesn't.

  23. Astrophysics
    • one year ago
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    You can check another way by finding the vertex, \[x= -\frac{ b }{ 2a }\]

  24. Astrophysics
    • one year ago
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    \[x = - \frac{ (-10) }{ 2(-5) } = -1\]

  25. anonymous
    • one year ago
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    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.

  26. anonymous
    • one year ago
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    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.

  27. IrishBoy123
    • one year ago
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    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

  28. Astrophysics
    • one year ago
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    lool

  29. anonymous
    • one year ago
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    That would be great... Technology is great when it works, horrible when it doesn't

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