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anonymous

  • one year ago

Need help now please!!!! domain and range help! y=sqrt3x and y=sqrt(5x-3)

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  1. anonymous
    • one year ago
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    @mathway

  2. anonymous
    • one year ago
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    anyone?

  3. Ac3
    • one year ago
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    you need the domain and range?

  4. anonymous
    • one year ago
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    yes for both of them

  5. Ac3
    • one year ago
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    Do you know how to graph them?

  6. anonymous
    • one year ago
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    yes i was getting like 0, infinity and stuff like that but wasn't sure if it was right

  7. Ac3
    • one year ago
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    ok what did you get for sqrt(3x)?

  8. anonymous
    • one year ago
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    let me check real quick

  9. anonymous
    • one year ago
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    ok i had x>=0 for domain and y<=0 for range

  10. Ac3
    • one year ago
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    |dw:1439165090472:dw|

  11. anonymous
    • one year ago
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    the second one went a little like domain 3/5 and range 0

  12. Ac3
    • one year ago
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    range of 0 is not possible

  13. anonymous
    • one year ago
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    okay. i knew i didn't know what i was doing..

  14. Ac3
    • one year ago
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    Domain is how far left and right (on x-axis) the graph goes.

  15. Ac3
    • one year ago
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    Range is how far up and down(on y-axis) the graph goes

  16. anonymous
    • one year ago
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    okay. makes sense.

  17. anonymous
    • one year ago
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    now how would i figure it out?

  18. anonymous
    • one year ago
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    i would rather have help then get it wrong again..

  19. Ac3
    • one year ago
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    By using the graph.

  20. Ac3
    • one year ago
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    Look at the graph how far to the left does it go?

  21. Ac3
    • one year ago
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    What x value?

  22. anonymous
    • one year ago
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    0

  23. Ac3
    • one year ago
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    ok now how far to the right?

  24. anonymous
    • one year ago
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    its infinity..

  25. anonymous
    • one year ago
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    it doesn't have a endpoint.

  26. Ac3
    • one year ago
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    exactly so for domain the common way of writing it is (left farthest x-value,right farthest x-value)

  27. anonymous
    • one year ago
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    so it'll be 0, infinity?

  28. Ac3
    • one year ago
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    so here it's [0,infiniti)

  29. anonymous
    • one year ago
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    okay now the range.

  30. Ac3
    • one year ago
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    keep in mind the graph does touch 0 so you have to use a bracket. You use the parenthesis when you don't touch the value. Since we never touch infinity we use a parenthesis.

  31. Ac3
    • one year ago
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    Ok now range

  32. Ac3
    • one year ago
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    What's the lowest point?

  33. anonymous
    • one year ago
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    okay. thanks for letting me know that because i wasn't even using those.

  34. anonymous
    • one year ago
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    0

  35. Ac3
    • one year ago
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    Ok and we do touch 0 correct?

  36. anonymous
    • one year ago
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    yes.

  37. Ac3
    • one year ago
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    ok so the first part of the range is [0,

  38. Ac3
    • one year ago
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    now what's the highest point?

  39. anonymous
    • one year ago
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    and it'll be infinity again right?

  40. Ac3
    • one year ago
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    Exactly, and because we don't touch it we use parenthesis.

  41. Ac3
    • one year ago
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    so the range is [0,infinity)

  42. anonymous
    • one year ago
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    awesome

  43. Ac3
    • one year ago
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    same as domain.

  44. Ac3
    • one year ago
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    Ok now on to the next one.

  45. anonymous
    • one year ago
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    [0.6,infinity) ?

  46. anonymous
    • one year ago
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    then the range is [0, infinity) ?

  47. Ac3
    • one year ago
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    Yes

  48. Ac3
    • one year ago
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    Keep in mind most professors don't like decimals. So rewrite domain as [3/5,infinity)

  49. anonymous
    • one year ago
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    awesome.. thank you! do you think you could stick around and see if you could help me with this other thing I'm stuck on?

  50. anonymous
    • one year ago
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    its finding the inverse of these functions and I've been stuck on it for hours

  51. Ac3
    • one year ago
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    Alright if it's quick I will make a new question though and close this one.

  52. Ac3
    • one year ago
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    Oh that's easy.

  53. anonymous
    • one year ago
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    so you want me to close this one?

  54. Ac3
    • one year ago
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    Yes you should.

  55. anonymous
    • one year ago
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    ok one second.

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