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anonymous

  • one year ago

y=x2-14x+44 find the domain and range, and the vertex of the following parabola. Show all work? Help?

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  1. anonymous
    • one year ago
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    @laughoutloud

  2. laughoutloud
    • one year ago
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    hey do want to know how to do it or just the answer either way doesn't matter to me

  3. anonymous
    • one year ago
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    Well, everytime I try to solve the vertex my teacher keeps saying its wrong. So I need help with that. Also with the whole domain and range thing.

  4. iGreen
    • one year ago
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    @laughoutloud By the looks of his username, I think he wants to learn how to do it instead of just getting an answer.

  5. anonymous
    • one year ago
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    Yeah, I'd love to learn how to do it XD

  6. laughoutloud
    • one year ago
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    ok, to find the vertex you need to use the formula \[\frac{ -b }{ 2a }\]

  7. anonymous
    • one year ago
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    Alright. So do I plug the x^2 into the 2a or the -b?

  8. laughoutloud
    • one year ago
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    that is going to help you find the x value

  9. anonymous
    • one year ago
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    and the -14 into the -b?

  10. laughoutloud
    • one year ago
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    you plug in \[\frac{ 14 }{ 2 }\]

  11. anonymous
    • one year ago
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    OK.

  12. anonymous
    • one year ago
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    That'd make X a 7?

  13. laughoutloud
    • one year ago
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    yes so x = 7 now you have to find the y value.

  14. laughoutloud
    • one year ago
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    What do you think you have to do?

  15. anonymous
    • one year ago
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    Alright, so I just plug 7 into all the X values

  16. laughoutloud
    • one year ago
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    yes

  17. anonymous
    • one year ago
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    Okay... Lemme solve it real quick

  18. anonymous
    • one year ago
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    y=(7)^2 - 14(7) + 44 y = 49 - 98 + 44 y = -49 + 44 y = -5 Is this correct?

  19. laughoutloud
    • one year ago
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    yes, I got the same

  20. laughoutloud
    • one year ago
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    so the vertex is?

  21. anonymous
    • one year ago
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    So, for the vertex it's (7, -5) right?

  22. laughoutloud
    • one year ago
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    yes

  23. anonymous
    • one year ago
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    Alright, how do we find the domain / range?

  24. laughoutloud
    • one year ago
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    the domain is going to be all of the x-values when this is graphed do you reach all of the x's eventually its kinda hard to explain

  25. laughoutloud
    • one year ago
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    That probably doesn't make sense

  26. anonymous
    • one year ago
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    Yeah... That's where I'm confused.

  27. laughoutloud
    • one year ago
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    Ok domain is all real

  28. anonymous
    • one year ago
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    Okay, sorry to trouble you more about the question... But sense I do all this stuff online and I'm just reading the stuff... How might I find the real numbers to explain to a teacher?

  29. laughoutloud
    • one year ago
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    sorry I'm not very good at explaining @carolinar7

  30. anonymous
    • one year ago
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    Alright, so.... Can you tell me how you got to your answer perhaps? @laughoutloud?

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